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87 results on '"Tabolenko, V"'

1. Large neutrino telescope Baikal-GVD: recent status

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: The Baikal-GVD is a deep-underwater neutrino telescope being constructed in Lake Baikal. After the winter 2023 deployment campaign the detector consists of 3456 optical modules installed on 96 vertical strings. The status of the detector and progress in data analysis are discussed in present report. The Baikal-GVD data collected in 2018-2022 indicate the presence of cosmic neutrino flux in high-energy cascade events consistent with observations by the IceCube neutrino telescope. Analysis of track-like events results in identification of first high-energy muon neutrino candidates. These and other results from 2018-2022 data samples are reviewed in this report.
Published: 2023
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2. Monitoring of optical properties of deep waters of Lake Baikal in 2021-2022

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, 0 R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, 0 R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: We present the results of the two-year (2021-2022) monitoring of absorption and scattering lengths of light with wavelength 400-620 nm within the effective volume of the deep underwater neutrino telescope Baikal-GVD, which were measured by a device Baikal-5D No.2. The Baikal-5D No.2. was installed during the 2021 winter expedition at a depth of 1180 m. The absorption and scattering lengths were measured every week in 9 spectral points. The device Baikal-5D No.2 also has the ability to measure detailed scattering and absorption spectra. The data obtained make it possible to estimate the range of changes in the absorption and scattering lengths over a sufficiently long period of time and to investigate the relationship between the processes of changes in absorption and scattering. An analysis was made of changes in absorption and scattering spectra for the period 2021-2022.
Published: 2023
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3. Studies of the ambient light of deep Baikal waters with Baikal-GVD

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, 0 R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, 0 R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: The Baikal-GVD neutrino detector is a deep-underwater neutrino telescope under construction and recently after the winter 2023 deployment it consists of 3456 optical modules attached on 96 vertical strings. This 3-dimensional array of photo-sensors allows to observe ambient light in the vicinity of the Baikal-GVD telescope that is associated mostly with water luminescence. Results on time and space variations of the luminescent activity are reviewed based on data collected in 2018-2022.
Published: 2023
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4. Track-Like Event Analysis at the Baikal-GVD Neutrino Telescope

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: Reconstructed tracks of muons produced in neutrino interactions provide the precise probe for the neutrino direction. Therefore, track-like events are a powerful tool to search for neutrino point sources. Recently, Baikal-GVD has demonstrated the first sample of low-energy neutrino candidate events extracted from the data of the season 2019 in a so-called single-cluster analysis - treating each cluster as an independent detector. In this paper, the extension of the track-like event analysis to a wider data set is discussed and the first high-energy track-like events are demonstrated. The status of multi-cluster track reconstruction and that of the event analysis are also discussed., Comment: Presented at the 38th International Cosmic Ray Conference (ICRC 2023)
Published: 2023

5. Baikal-GVD Astrophysical Neutrino Candidate near the Blazar TXS~0506+056

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Erkenov, D. Y. Zvezdov A. K., Kosogorov, N. A., Kovalev, Y. A., Kovalev, Y. Y., Plavin, A. V., Popkov, A. V., Pushkarev, A. B., Semikoz, D. V., Sotnikova, Y. V., Troitsky, S. V., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Erkenov, D. Y. Zvezdov A. K., Kosogorov, N. A., Kovalev, Y. A., Kovalev, Y. Y., Plavin, A. V., Popkov, A. V., Pushkarev, A. B., Semikoz, D. V., Sotnikova, Y. V., and Troitsky, S. V.
Abstract: We report on the observation of a rare neutrino event detected by Baikal-GVD in April 2021. The event GVD210418CA is the highest-energy cascade observed by Baikal-GVD so far from the direction below the horizon. The estimated cascade energy is $224\pm75$~TeV. The evaluated signalness parameter of GVD210418CA is 97.1\% using an assumption of the E$^{-2.46}$ spectrum of astrophysical neutrinos. The arrival direction of GVD210418CA is near the position of the well-known radio blazar TXS~0506+056, with the angular distance being within a 90\% directional uncertainty region of the Baikal-GVD measurement. The event was followed by a radio flare observed by the RATAN-600 radio telescope, further strengthening the case for the neutrino-blazar association., Comment: 9 pages, 6 figures, Contribution to the 38th International Cosmic Rays Conference (ICRC2023). arXiv admin note: text overlap with arXiv:2210.01650
Published: 2023

6. Diffuse neutrino flux measurements with the Baikal-GVD neutrino telescope

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Kosogorov, N. A., Kovalev, Y. Y., Lipunova, G. V., Plavin, A. V., Semikoz, D. V., Troitsky, S. V., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Kosogorov, N. A., Kovalev, Y. Y., Lipunova, G. V., Plavin, A. V., Semikoz, D. V., and Troitsky, S. V.
Abstract: Baikal-GVD is a next generation, kilometer-scale neutrino telescope currently under construction in Lake Baikal. GVD consists of multi-megaton subarrays (clusters) and is designed for the detection of astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. The large detector volume and modular design of Baikal-GVD allows for the measurements of the astrophysical diffuse neutrino flux to be performed already at early phases of the array construction. We present here recent results of the measurements on the diffuse cosmic neutrino flux obtained with the Baikal-GVD neutrino telescope using cascade-like events., Comment: Presented at the 38th International Cosmic Ray Conference (ICRC 2023)
Published: 2023
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7. Atmospheric muon suppression for Baikal-GVD cascade analysis

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: Baikal-GVD (Gigaton Volume Detector) is a neutrino telescope installed at a depth of 1366 m in Lake Baikal. The expedition of 2023 brought the number of optical modules in the array up to 3492 (including experimental strings). These optical modules detect the Cherenkov radiation from secondary charged particles coming from the neutrino interactions. Neutrinos produce different kinds of topologically distinct light signatures. Charged current muon neutrino interactions create an elongated track in the water. Charged and neutral current interactions of other neutrino flavors yield hadronic and electromagnetic cascades. The background in the neutrino cascade channel arises mainly due to discrete stochastic energy losses produced along atmospheric muon tracks. In this paper, a developed algorithm for the cascade event selection is presented., Comment: Presented at the 38th International Cosmic Ray Conference (ICRC 2023)
Published: 2023
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8. Improving the efficiency of cascade detection by the Baikal-GVD neutrino telescope

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: The deployment of the Baikal-GVD deep underwater neutrino telescope is in progress now. About 3500 deep underwater photodetectors (optical modules) arranged into 12 clusters are operating in Lake Baikal. For increasing the efficiency of cascade-like neutrino event detection, the telescope deployment scheme was slightly changed. Namely, the inter-cluster distance was reduced for the newly deployed clusters and additional string of optical modules are added between the clusters. The first inter-cluster string was installed in 2022 and two such strings were installed in 2023. This paper presents a Monte Carlo estimate of the impact of these configuration changes on the cascade detection efficiency as well as technical implementation and results of in-situ tests of the inter-cluster strings., Comment: Presented at the 38th International Cosmic Ray Conference (ICRC 2023)
Published: 2023
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9. Large neutrino telescope Baikal-GVD: recent status

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, 5 V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: The Baikal-GVD is a deep-underwater neutrino telescope being constructed in Lake Baikal. After the winter 2023 deployment campaign the detector consists of 3456 optical modules installed on 96 vertical strings. The status of the detector and progress in data analysis are discussed in present report. The Baikal-GVD data collected in 2018-2022 indicate the presence of cosmic neutrino flux in high-energy cascade events consistent with observations by the IceCube neutrino telescope. Analysis of track-like events results in identification of first high-energy muon neutrino candidates. These and other results from 2018-2022 data samples are reviewed in this report.
Published: 2023
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10. Double cascade reconstruction in the Baikal-GVD neutrino telescope

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: Baikal Gigaton Volume Detector is a cubic kilometer scale neutrino telescope under construction in Lake Baikal. As of July 2023, Baikal-GVD consists of 96 fully deployed strings resulting in 3456 optical modules installed. The observation of neutrinos is based on detection of Cherenkov radiation emitted by the products of neutrino interactions. In this contribution, description of the double cascade reconstruction technique as well as evaluation of precision of this algorithm is given., Comment: Presented at the 38th International Cosmic Ray Conference (ICRC 2023)
Published: 2023
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11. Time Calibration of the Baikal-GVD Neutrino Telescope with Atmospheric Muons

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: We present a new procedure for time calibration of the Baikal-GVD neutrino telescope. The track reconstruction quality depends on accurate measurements of arrival times of Cherenkov photons. Therefore, it is crucial to achieve a high precision in time calibration. For that purpose, in addition to other calibration methods, we employ a new procedure using atmospheric muons reconstructed in a single-cluster mode. The method is based on iterative determination of effective time offsets for each optical module. This paper focuses on the results of the iterative reconstruction procedure with time offsets from the previous iteration and the verification of the method developed. The theoretical muon calibration precision is estimated to be around 1.5-1.6ns., Comment: 38th International Cosmic Ray Conference (ICRC2023)
Published: 2023

12. Baikal-GVD Real-Time Data Processing and Follow-Up Analysis of GCN Notices

Author: Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Aynutdinov, V. M., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Bardačová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chadymov, V. A., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I. V., Khramov, E. V., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., and Zvezdov, D. Y.
Abstract: The Baikal-GVD alert system was launched at the beginning of 2021. There are alerts for muon neutrinos (long upward-going track-like events) and all-flavour neutrinos (high-energy cascades). The system is able to get a preliminary response to external alerts with a temporal delay of about 3-10 minutes. The Baikal-GVD data processing and the results of the follow-up procedure are described. We report on the analysis of the coincidence in time and direction between the Baikal-GVD cascade GVD20211208CA with an estimated energy of 43 TeV and the announced alert IceCube211208A possibly associated with a flaring state of the blazar PKS 0735+178., Comment: 9 pages, 5 figures
Published: 2023
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13. Search for directional associations between Baikal Gigaton Volume Detector neutrino-induced cascades and high-energy astrophysical sources

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bardacová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Kosogorov, N. A., Kovalev, Y. Y., Lipunova, G. V., Plavin, A. V., Semikoz, D. V., Troitsky, S. V., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bardacová, Z., Belolaptikov, I. A., Bondarev, E. A., Borina, I. V., Budnev, N. M., Chepurnov, A. S., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kharuk, I., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Lemeshev, Y. E., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Seitova, D., Shaybonov, B. A., Shelepov, M. D., Shilkin, S. D., Shirokov, E. V., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Kosogorov, N. A., Kovalev, Y. Y., Lipunova, G. V., Plavin, A. V., Semikoz, D. V., and Troitsky, S. V.
Abstract: Baikal-GVD has recently published its first measurement of the diffuse astrophysical neutrino flux, performed using high-energy cascade-like events. We further explore the Baikal-GVD cascade dataset collected in 2018-2022, with the aim to identify possible associations between the Baikal-GVD neutrinos and known astrophysical sources. We leverage the relatively high angular resolution of the Baikal-GVD neutrino telescope (2-3 deg.), made possible by the use of liquid water as the detection medium, enabling the study of astrophysical point sources even with cascade events. We estimate the telescope's sensitivity in the cascade channel for high-energy astrophysical sources and refine our analysis prescriptions using Monte-Carlo simulations. We primarily focus on cascades with energies exceeding 100 TeV, which we employ to search for correlation with radio-bright blazars. Although the currently limited neutrino sample size provides no statistically significant effects, our analysis suggests a number of possible associations with both extragalactic and Galactic sources. Specifically, we present an analysis of an observed triplet of neutrino candidate events in the Galactic plane, focusing on its potential connection with certain Galactic sources, and discuss the coincidence of cascades with several bright and flaring blazars., Comment: 10 pages, 3 figures, accepted for publication in MNRAS
Published: 2023
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14. Increasing the sensitivity of the Baikal-GVD neutrino telescope by using external strings of optical modules

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kebkal, V. K., Khatun, A., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Seitova, D., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Yablokova, Y. V., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kebkal, V. K., Khatun, A., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Seitova, D., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Yablokova, Y. V., and Zaborov, D. N.
Abstract: The deployment of the Baikal-GVD deep underwater neutrino telescope is continuing in Lake Baikal. By April 2022, ten clusters of the telescope were put into operation, with 2880 optical modules in total. One of the relevant tasks in this context is to study the possibilities of increasing the efficiency of the detector based on the experience of its operation and the results obtained at other neutrino telescopes in recent years. In this paper, a variant of optimizing the configuration of the telescope is considered, based on the installation of additional strings of optical modules between the clusters (external strings). An experimental version of the external string was installed in Lake Baikal in April 2022. This paper presents a first estimate of the impact of adding external strings on the neutrino detection efficiency, as well as the technical implementation of the detection and data acquisition systems of the external string and first results of its in-situ tests., Comment: 12 pages, in Russian language, 7 figures, 1 Table
Published: 2022

15. Diffuse neutrino flux measurements with the Baikal-GVD neutrino telescope

Author: Baikal Collaboration, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kebkal, V. K., Khatun, A., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Seitova, D., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Yablokova, Y. V., Zaborov, D. N., Baikal Collaboration, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kebkal, V. K., Khatun, A., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Seitova, D., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Yablokova, Y. V., and Zaborov, D. N.
Abstract: We report on the first observation of the diffuse cosmic neutrino flux with the Baikal-GVD neutrino telescope. Using cascade-like events collected by Baikal-GVD in 2018--2021, a significant excess of events over the expected atmospheric background is observed. This excess is consistent with the high-energy diffuse cosmic neutrino flux observed by IceCube. The null cosmic flux assumption is rejected with a significance of 3.05$\sigma$. Assuming a single power law model of the astrophysical neutrino flux with identical contribution from each neutrino flavor, the following best-fit parameter values are found: the spectral index $\gamma_{astro}$ = $2.58^{+0.27}_{-0.33}$ and the flux normalization $\phi_{astro}$ = 3.04$^{+1.52}_{-1.21}$ per one flavor at 100 TeV., Comment: 9 pages; 5 figures; 2 tables
Published: 2022
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16. TAIGA -- an advanced hybrid detector complex for astroparticle physics and high energy gamma-ray astronomy

Author: Budnev, N. M., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Poddubnyi, I., Podgrudkov, D., Ponomareva, V., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, A., Silaev, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tkachev, L., Tanaev, A., Ternovoy, M., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., Yashin, I., Budnev, N. M., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Poddubnyi, I., Podgrudkov, D., Ponomareva, V., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Samoliga, V., Satyshev, A., Silaev, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tkachev, L., Tanaev, A., Ternovoy, M., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., and Yashin, I.
Abstract: The physical motivations, present status, main results in study of cosmic rays and in the field of gamma-ray astronomy as well future plans of the TAIGA-1 (Tunka Advanced Instrument for cosmic ray physics and Gamma Astronomy) project are presented. The TAIGA observatory addresses ground-based gamma-ray astronomy and astroparticle physics at energies from a few TeV to several PeV, as well as cosmic ray physics from 100 TeV to several EeV. The pilot TAIGA-1 complex is located in the Tunka valley, ~50 km west from the southern tip of the lake Baikal., Comment: Submission to SciPost Phys. Proc., 10 pages, 2 figures
Published: 2022

17. Primary Cosmic Rays Energy Spectrum and Mean Mass Composition by the Data of the TAIGA Astrophysical Complex

Author: Prosin, V., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Bulan, A., Chiavassa, A., Chernov, D., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, E., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Komponiets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Okuneva, E., Osipova, E., Pakhorukov, A., Pan, A., Panasenko, L., Pankov, L., Panov, A. D., Petrukhin, A., Poddubny, I., Podgrudkov, D., Poleschuk, V., Ponomareva, V., Popova, E., Postnikov, E., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Silaev, A., Silaev Jr, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tanaev, A., Tarashchansky, B., Ternovoy, M. Y., Tkachev, L., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhaglova, A., Zhurov, D., Yashin, I., Prosin, V., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Bulan, A., Chiavassa, A., Chernov, D., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, O., Gress, E., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Ivanova, A. L., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Komponiets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Okuneva, E., Osipova, E., Pakhorukov, A., Pan, A., Panasenko, L., Pankov, L., Panov, A. D., Petrukhin, A., Poddubny, I., Podgrudkov, D., Poleschuk, V., Ponomareva, V., Popova, E., Postnikov, E., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Silaev, A., Silaev Jr, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tanaev, A., Tarashchansky, B., Ternovoy, M. Y., Tkachev, L., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhaglova, A., Zhurov, D., and Yashin, I.
Abstract: The corrected dependence of the mean depth of the EAS maximum $X_{max}$ on the energy was obtained from the data of the Tunka-133 array for 7 years and the TAIGA-HiSCORE array for 2 years. The parameter $\langle\ln A\rangle$, characterizing the mean mass compositon was derived from these results. The differential energy spectrum of primary cosmic rays in the energy range of $2\cdot 10^{14}$ - $2\cdot 10^{16}$\,eV was reconstructed using the new parameter $Q_{100}$ the Cherenkov light flux at the core distance 100 m.}, Comment: 6 pages, 3 figures, Submitted to SciPost Phys.Proc
Published: 2022

18. The Tunka-Grande scintillation array: current results

Author: Ivanova, A. L., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Budnev, N., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Poddubnyi, I., Podgrudkov, D., Poleschuk, V., Ponomareva, V., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Satyshev, A., Silaev, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tkachev, L., Tanaev, A., Ternovoy, M., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., Yashin, I., Ivanova, A. L., Astapov, I., Bezyazeekov, P., Bonvech, E., Borodin, A., Budnev, N., Bulan, A., Chernov, D., Chiavassa, A., Dyachok, A., Gafarov, A., Garmash, A., Grebenyuk, V., Gress, E., Gress, O., Gress, T., Grinyuk, A., Grishin, O., Ivanova, A. D., Kalmykov, N., Kindin, V., Kiryuhin, S., Kokoulin, R., Kompaniets, K., Korosteleva, E., Kozhin, V., Kravchenko, E., Kryukov, A., Kuzmichev, L., Lagutin, A., Lavrova, M., Lemeshev, Y., Lubsandorzhiev, B., Lubsandorzhiev, N., Lukanov, A., Lukyantsev, D., Malakhov, S., Mirgazov, R., Monkhoev, R., Osipova, E., Pakhorukov, A., Pankov, L., Pan, A., Panov, A., Petrukhin, A., Poddubnyi, I., Podgrudkov, D., Poleschuk, V., Ponomareva, V., Popova, E., Postnikov, E., Prosin, V., Ptuskin, V., Pushnin, A., Raikin, R., Razumov, A., Rubtsov, G., Ryabov, E., Sagan, Y., Samoliga, V., Satyshev, A., Silaev, A., Sidorenkov, A., Skurikhin, A., Sokolov, A., Sveshnikova, L., Tabolenko, V., Tkachev, L., Tanaev, A., Ternovoy, M., Togoo, R., Ushakov, N., Vaidyanathan, A., Volchugov, P., Volkov, N., Voronin, D., Zagorodnikov, A., Zhurov, D., and Yashin, I.
Abstract: The Tunka-Grande experiment is a scintillation array with about 0.5 sq.km sensitive area at Tunka Valley, Siberia, for measuring charged particles and muons in extensive air showers (EASs). Tunka-Grande is optimized for cosmic ray studies in the energy range 10 PeV to about 1 EeV, where exploring the composition is of fundamental importance for understanding the transition from galactic to extragalactic origin of cosmic rays. This paper attempts to provide a synopsis of the current results of the experiment. In particular, the reconstruction of the all-particle energy spectrum in the range of 10 PeV to 1 EeV based on experimental data from four observation seasons is presented., Comment: 7 pages, 3 figures, submission to SciPost Phys. Proc
Published: 2022

19. Search for Astrophysical Nanosecond Optical Transients with TAIGA-HiSCORE Array

Author: Panov, A. D., Astapov, I. I., Awad, A. K., Beskin, G. M., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Bruckner, M., Budnev, N. M., Bulan, A. V., Chernov, D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Horns, D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Krivopalova, A. A., Kuzmichev, L. A., Kryukov, A. P., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A., Rjabov, E., Rubtsov, G. I., Sagan, Y. I., Samoliga, V. S., Sidorenkov, A. Yu., Silaev, A. A., Skurikhin, A. V., Satyshev, I., Sokolov, A. V., Suvorkin, Y., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Volchugov, P. A., Volkov, N. V., Voronin, D., Wischnewski, R., Yashin, I. I., Zagorodnikov, A. V., Zhurov, D. P., Panov, A. D., Astapov, I. I., Awad, A. K., Beskin, G. M., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Bruckner, M., Budnev, N. M., Bulan, A. V., Chernov, D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Horns, D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Krivopalova, A. A., Kuzmichev, L. A., Kryukov, A. P., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A., Rjabov, E., Rubtsov, G. I., Sagan, Y. I., Samoliga, V. S., Sidorenkov, A. Yu., Silaev, A. A., Skurikhin, A. V., Satyshev, I., Sokolov, A. V., Suvorkin, Y., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Volchugov, P. A., Volkov, N. V., Voronin, D., Wischnewski, R., Yashin, I. I., Zagorodnikov, A. V., and Zhurov, D. P.
Abstract: A wide-angle Cerenkov array TAIGA-HiSCORE (FOV $\sim$0.6 sr), was originally created as a part of TAIGA installation for high-energy gamma-ray astronomy and cosmic ray physics. Array now consist on nearly 100 optical stations on the area of 1 km$^2$. Due to high accuracy and stability ($\sim$1 ns) of time synchronization of the optical stations the accuracy of EAS arrival direction reconstruction is reached 0.1$^\mathrm{o}$. It was proven that the array can also be used to search for nanosecond events of the optical range. The report discusses the method of searching for optical transients using the HiSCORE array and demonstrates its performance on a real example of detecting signals from an artificial Earth satellite. The search for this short flares in the HiSCORE data of the winter season 2018--2019 is carried out. One candidate for double repeater has been detected, but the estimated probability of random simulation of such a transient by background EAS events is not less than 10%, which does not allow us to say that the detected candidate corresponds to a real astrophysical transient. An upper bound on the frequency of optical spikes with flux density of more than $10^{-4} \mathrm{erg/s/cm}^2$ and a duration of more than 5\,ns is established as $\sim 2 \times 10^{-3}$ events/sr/hour., Comment: 15 pages, 6 figures, reported at the conference ISCRA-2021, Accepted for publication in Physics of Atomic Nuclei
Published: 2021
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20. Development of the Double Cascade Reconstruction Techniques in the Baikal-GVD Neutrino Telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD is a neutrino telescope under construction in Lake Baikal. The main goal of the Baikal-GVD is to observe neutrinos via detecting the Cherenkov radiation of the secondary charged particles originating in the interactions of neutrinos. In 2021, the installation works concluded with 2304 optical modules installed in the lake resulting in effective volume approximately 0.4 km$^{3}$. In this paper, the first steps in the development of double cascade reconstruction techniques are presented., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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21. Proposal for fiber optic data acquisition system for Baikal-GVD

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The first stage of the construction of the deep underwater neutrino telescope Baikal-GVD is planned to be completed in 2024. The second stage of the detector deployment is planned to be carried out using a data acquisition system based on fibre optic technologies, which will allow for increased data throughput and more flexible trigger conditions. A dedicated test facility has been built and deployed at the Baikal-GVD site to test the new technological solutions. We present the principles of operation and results of tests of the new data acquisition system., Comment: 4 pages, 1 figure, presented at the Conference VLVnT 2021
Published: 2021
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22. Data Quality Monitoring system of the Baikal-GVD experiment

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The main purpose of the Baikal-GVD Data Quality Monitoring (DQM) system is to monitor the status of the detector and collected data. The system estimates quality of the recorded signals and performs the data validation. The DQM system is integrated with the Baikal-GVD's unified software framework ("BARS") and operates in quasi-online manner. This allows us to react promptly and effectively to the changes in the telescope conditions., Comment: Contribution from the Baikal-GVD Collaboration presented at the 37th International Cosmic Ray Conference, Online - Berlin, Germany, 12-23 July 2021. Proceeding: PoS-ICRC2021-1094
Published: 2021
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23. Method and portable bench for tests of the laser optical calibration system components for the Baikal-GVD underwater neutrino Cherenkov telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fialkovski, L. Fajt f S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fialkovski, L. Fajt f S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The large-scale deep underwater Cherenkov neutrino telescopes like Baikal-GVD, ANTARES or KM3NeT, require calibration and testing methods of their optical modules. These methods usually include laser-based systems which allow to check the telescope responses to the light and for real-time monitoring of the optical parameters of water such as absorption and scattering lengths, which show seasonal changes in natural reservoirs of water. We will present a testing method of a laser calibration system and a set of dedicated tools developed for Baikal- GVD, which includes a specially designed and built, compact, portable, and reconfigurable scanning station. This station is adapted to perform fast quality tests of the underwater laser sets just before their deployment in the telescope structure, even on ice, without darkroom. The testing procedure includes the energy stability test of the laser device, 3D scan of the light emission from the diffuser and attenuation test of the optical elements of the laser calibration system. The test bench consists primarily of an automatic mechanical scanner with a movable Si detector, beam splitter with a reference Si detector and, optionally, Q-switched diode-pumped solid-state laser used for laboratory scans of the diffusers. The presented test bench enables a three-dimensional scan of the light emission from diffusers, which are designed to obtain the isotropic distribution of photons around the point of emission. The results of the measurement can be easily shown on a 3D plot immediately after the test and may be also implemented to a dedicated program simulating photons propagation in water, which allows to check the quality of the diffuser in the scale of the Baikal-GVD telescope geometry., Comment: Presented at the VLVnT - Very Large Volume Neutrino Telescope Workshop, Valencia, 18-21 May 2021
Published: 2021
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24. Follow up of the IceCube alerts with the Baikal-GVD telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The high-energy muon neutrino events of the IceCube telescope, that are triggered as neutrino alerts in one of two probability ranks of astrophysical origin, "gold" and "bronze", have been followed up by the Baikal-GVD in a fast quasi-online mode since September 2020. Search for correlations between alerts and GVD events reconstructed in two modes, muon-track and cascades (electromagnetic or hadronic showers), for the time windows $ \pm $ 1 h and $ \pm $ 12 h does not indicate statistically significant excess of the measured events over the expected number of background events. Upper limits on the neutrino fluence will be presented for each alert., Comment: 5 pages, 5 figures, Proceedings for the VLVnT 2021 conference, submitted to JINST
Published: 2021
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25. The Baikal-GVD neutrino telescope: search for high-energy cascades

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: Baikal-GVD is a neutrino telescope currently under construction in Lake Baikal. GVD is formed by multi-meganton subarrays (clusters). The design of Baikal-GVD allows one to search for astrophysical neutrinos already at early phases of the array construction. We present here preliminary results of a search for high-energy neutrinos with GVD in 2019-2020., Comment: Submitted to Proc. of the 37th International Cosmic Ray Conference (ICRC 2021), PoS-1144, July 12th -- 23rd, 2021, Online -- Berlin, Germany. 8 pages, 7 figures
Published: 2021

26. Multi-messenger and real-time astrophysics with the Baikal-GVD telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD deep underwater neutrino experiment participates in the international multi-messenger program on discovering the astrophysical sources of high energy fluxes of cosmic particles, while being at the stage of deployment with a gradual increase of its effective volume to the scale of a cubic kilometer. In April 2021 the effective volume of the detector has been reached 0.4 km3 for cascade events with energy above 100 TeV generated by neutrino interactions in Lake Baikal. The alarm system in real-time monitoring of the celestial sphere was launched at the beginning of 2021, that allows to form the alerts of two ranks like "muon neutrino" and "VHE cascade". Recent results of fast follow-up searches for coincidences of Baikal-GVD high energy cascades with ANTARES/TAToO high energy neutrino alerts and IceCube GCN messages will be presented, as well as preliminary results of searches for high energy neutrinos in coincidence with the magnetar SGR 1935+2154 activity in period of radio and gamma burst in 2020., Comment: Submitted to Proc. of the 37th International Cosmic Ray Conference (ICRC 2021), PoS-0946, July 12th -- 23rd, 2021, Online -- Berlin, Germany. 8 pages, 5 figures
Published: 2021

27. Automatic data processing for Baikal-GVD neutrino observatory

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: Baikal-GVD is a gigaton-scale neutrino observatory under construction in Lake Baikal. It currently produces about 100 GB of data every day. For their automatic processing, the Baikal Analysis and Reconstruction software (BARS) was developed. At the moment, it includes such stages as hit extraction from PMT waveforms, assembling events from raw data, assigning timestamps to events, determining the position of the optical modules using an acoustic positioning system, data quality monitoring, muon track and cascade reconstruction, as well as the alert signal generation. These stages are implemented as C++ programs which are executed sequentially one after another and can be represented as a directed acyclic graph. The most resource-consuming programs run in parallel to speed up processing. A separate Python package based on the luigi package is responsible for program execution control. Additional information such as the program execution status and run metadata are saved into a central database and then displayed on the dashboard. Results can be obtained several hours after the run completion., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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28. Methods for the suppression of background cascades produced along atmospheric muon tracks in the Baikal-GVD

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD (Gigaton Volume Detector) is a km$^{3}$- scale neutrino telescope located in Lake Baikal. Currently (year 2021) the Baikal-GVD is composed of 2304 optical modules divided to 8 independent detection units, called clusters. Specific neutrino interactions can cause Cherenkov light topology, referred to as a cascade. However, cascade-like events originate from discrete stochastic energy losses along muon tracks. These cascades produce the most abundant background in searching for high-energy neutrino cascade events. Several methods have been developed, optimized, and tested to suppress background cascades., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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29. An efficient hit finding algorithm for Baikal-GVD muon reconstruction

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD is a large scale neutrino telescope being constructed in Lake Baikal. The majority of signal detected by the telescope are noise hits, caused primarily by the luminescence of the Baikal water. Separating noise hits from the hits produced by Cherenkov light emitted from the muon track is a challenging part of the muon event reconstruction. We present an algorithm that utilizes a known directional hit causality criterion to contruct a graph of hits and then use a clique-based technique to select the subset of signal hits.The algorithm was tested on realistic detector Monte-Carlo simulation for a wide range of muon energies and has proved to select a pure sample of PMT hits from Cherenkov photons while retaining above 90\% of original signal., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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30. The Baikal-GVD neutrino telescope as an instrument for studying Baikal water luminescence

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: We present data on the Baikal water luminescence collected with the Baikal-GVD neutrino telescope. This three-dimensional array of photo-sensors allows the observation of time and spatial variations of the ambient light field. We report on annual increase of luminescence activity in years 2018-2020. We observed a unique event of a highly luminescent layer propagating upwards with a maximum speed of 28 m/day for the first time., Comment: Contribution at 37th International Cosmic Ray Conference (ICRC 2021). arXiv admin note: text overlap with arXiv:1908.06509
Published: 2021
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31. Positioning system for Baikal-GVD

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: Baikal-GVD is a kilometer scale neutrino telescope currently under construction in Lake Baikal. Due to water currents in Lake Baikal, individual photomultiplier housings are mobile and can drift away from their initial position. In order to accurately determine the coordinates of the photomultipliers, the telescope is equipped with an acoustic positioning system. The system consists of a network of acoustic modems, installed along the telescope strings and uses acoustic trilateration to determine the coordinates of individual modems. This contribution discusses the current state of the positioning in Baikal-GVD, including the recent upgrade to the acoustic modem polling algorithm., Comment: Presented at 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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32. Measuring muon tracks in Baikal-GVD using a fast reconstruction algorithm

Author: Collaboration, Baikal-GVD, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Collaboration, Baikal-GVD, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal Gigaton Volume Detector (Baikal-GVD) is a km$^3$-scale neutrino detector currently under construction in Lake Baikal, Russia. The detector consists of several thousand optical sensors arranged on vertical strings, with 36 sensors per string. The strings are grouped into clusters of 8 strings each. Each cluster can operate as a stand-alone neutrino detector. The detector layout is optimized for the measurement of astrophysical neutrinos with energies of $\sim$ 100 TeV and above. Events resulting from charged current interactions of muon (anti-)neutrinos will have a track-like topology in Baikal-GVD. A fast $\chi^2$-based reconstruction algorithm has been developed to reconstruct such track-like events. The algorithm has been applied to data collected in 2019 from the first five operational clusters of Baikal-GVD, resulting in observations of both downgoing atmospheric muons and upgoing atmospheric neutrinos. This serves as an important milestone towards experimental validation of the Baikal-GVD design. The analysis is limited to single-cluster data, favoring nearly-vertical tracks., Comment: 15 pages, 6 figures, 1 table, to be published in Eur. Phys. J. C
Published: 2021
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33. The Baikal-GVD neutrino telescope as an instrument for studying Baikal water luminescence

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: We present data on the Baikal water luminescence collected with the Baikal-GVD neutrino telescope. This three-dimensional array of photo-sensors allows the observation of time and spatial variations of the ambient light field. We report on annual increase of luminescence activity in years 2018-2020. We observed a unique event of a highly luminescent layer propagating upwards with a maximum speed of 28 m/day for the first time., Comment: Contribution at 37th International Cosmic Ray Conference (ICRC 2021). arXiv admin note: text overlap with arXiv:1908.06509
Published: 2021
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34. Measuring muon tracks in Baikal-GVD using a fast reconstruction algorithm

Author: Collaboration, Baikal-GVD, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Collaboration, Baikal-GVD, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal Gigaton Volume Detector (Baikal-GVD) is a km$^3$-scale neutrino detector currently under construction in Lake Baikal, Russia. The detector consists of several thousand optical sensors arranged on vertical strings, with 36 sensors per string. The strings are grouped into clusters of 8 strings each. Each cluster can operate as a stand-alone neutrino detector. The detector layout is optimized for the measurement of astrophysical neutrinos with energies of $\sim$ 100 TeV and above. Events resulting from charged current interactions of muon (anti-)neutrinos will have a track-like topology in Baikal-GVD. A fast $\chi^2$-based reconstruction algorithm has been developed to reconstruct such track-like events. The algorithm has been applied to data collected in 2019 from the first five operational clusters of Baikal-GVD, resulting in observations of both downgoing atmospheric muons and upgoing atmospheric neutrinos. This serves as an important milestone towards experimental validation of the Baikal-GVD design. The analysis is limited to single-cluster data, favoring nearly-vertical tracks., Comment: 15 pages, 6 figures, 1 table, to be published in Eur. Phys. J. C
Published: 2021
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35. Search for Astrophysical Nanosecond Optical Transients with TAIGA-HiSCORE Array

Author: Panov, A. D., Astapov, I. I., Awad, A. K., Beskin, G. M., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Bruckner, M., Budnev, N. M., Bulan, A. V., Chernov, D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Horns, D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Krivopalova, A. A., Kuzmichev, L. A., Kryukov, A. P., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A., Rjabov, E., Rubtsov, G. I., Sagan, Y. I., Samoliga, V. S., Sidorenkov, A. Yu., Silaev, A. A., Skurikhin, A. V., Satyshev, I., Sokolov, A. V., Suvorkin, Y., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Volchugov, P. A., Volkov, N. V., Voronin, D., Wischnewski, R., Yashin, I. I., Zagorodnikov, A. V., Zhurov, D. P., Panov, A. D., Astapov, I. I., Awad, A. K., Beskin, G. M., Bezyazeekov, P. A., Blank, M., Bonvech, E. A., Borodin, A. N., Bruckner, M., Budnev, N. M., Bulan, A. V., Chernov, D. V., Chiavassa, A., Dyachok, A. N., Gafarov, A. R., Garmash, A. Yu., Grebenyuk, V. M., Gress, O. A., Gress, T. I., Grinyuk, A. A., Grishin, O. G., Horns, D., Ivanova, A. L., Kalmykov, N. N., Kindin, V. V., Kiryuhin, S. N., Kokoulin, R. P., Kompaniets, K. G., Korosteleva, E. E., Kozhin, V. A., Kravchenko, E. A., Krivopalova, A. A., Kuzmichev, L. A., Kryukov, A. P., Lagutin, A. A., Lavrova, M. V., Lemeshev, Yu., Lubsandorzhiev, B. K., Lubsandorzhiev, N. B., Lukanov, A. D., Mirgazov, R. R., Mirzoyan, R., Monkhoev, R. D., Osipova, E. A., Pakhorukov, A. L., Pan, A., Pankov, L. V., Petrukhin, A. A., Podgrudkov, D. A., Poleschuk, V. A., Popova, E. G., Porelli, A., Postnikov, E. B., Prosin, V. V., Ptuskin, V. S., Pushnin, A. A., Raikin, R. I., Razumov, A., Rjabov, E., Rubtsov, G. I., Sagan, Y. I., Samoliga, V. S., Sidorenkov, A. Yu., Silaev, A. A., Skurikhin, A. V., Satyshev, I., Sokolov, A. V., Suvorkin, Y., Sveshnikova, L. G., Tabolenko, V. A., Tanaev, A. B., Tarashansky, B. A., Ternovoy, M., Tkachev, L. G., Tluczykont, M., Ushakov, N., Vaidyanathan, A., Volchugov, P. A., Volkov, N. V., Voronin, D., Wischnewski, R., Yashin, I. I., Zagorodnikov, A. V., and Zhurov, D. P.
Abstract: A wide-angle Cerenkov array TAIGA-HiSCORE (FOV $\sim$0.6 sr), was originally created as a part of TAIGA installation for high-energy gamma-ray astronomy and cosmic ray physics. Array now consist on nearly 100 optical stations on the area of 1 km$^2$. Due to high accuracy and stability ($\sim$1 ns) of time synchronization of the optical stations the accuracy of EAS arrival direction reconstruction is reached 0.1$^\mathrm{o}$. It was proven that the array can also be used to search for nanosecond events of the optical range. The report discusses the method of searching for optical transients using the HiSCORE array and demonstrates its performance on a real example of detecting signals from an artificial Earth satellite. The search for this short flares in the HiSCORE data of the winter season 2018--2019 is carried out. One candidate for double repeater has been detected, but the estimated probability of random simulation of such a transient by background EAS events is not less than 10%, which does not allow us to say that the detected candidate corresponds to a real astrophysical transient. An upper bound on the frequency of optical spikes with flux density of more than $10^{-4} \mathrm{erg/s/cm}^2$ and a duration of more than 5\,ns is established as $\sim 2 \times 10^{-3}$ events/sr/hour., Comment: 15 pages, 6 figures, reported at the conference ISCRA-2021, Accepted for publication in Physics of Atomic Nuclei
Published: 2021
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36. Data Quality Monitoring system of the Baikal-GVD experiment

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The main purpose of the Baikal-GVD Data Quality Monitoring (DQM) system is to monitor the status of the detector and collected data. The system estimates quality of the recorded signals and performs the data validation. The DQM system is integrated with the Baikal-GVD's unified software framework ("BARS") and operates in quasi-online manner. This allows us to react promptly and effectively to the changes in the telescope conditions., Comment: Contribution from the Baikal-GVD Collaboration presented at the 37th International Cosmic Ray Conference, Online - Berlin, Germany, 12-23 July 2021. Proceeding: PoS-ICRC2021-1094
Published: 2021
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37. Development of the Double Cascade Reconstruction Techniques in the Baikal-GVD Neutrino Telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD is a neutrino telescope under construction in Lake Baikal. The main goal of the Baikal-GVD is to observe neutrinos via detecting the Cherenkov radiation of the secondary charged particles originating in the interactions of neutrinos. In 2021, the installation works concluded with 2304 optical modules installed in the lake resulting in effective volume approximately 0.4 km$^{3}$. In this paper, the first steps in the development of double cascade reconstruction techniques are presented., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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38. Multi-messenger and real-time astrophysics with the Baikal-GVD telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD deep underwater neutrino experiment participates in the international multi-messenger program on discovering the astrophysical sources of high energy fluxes of cosmic particles, while being at the stage of deployment with a gradual increase of its effective volume to the scale of a cubic kilometer. In April 2021 the effective volume of the detector has been reached 0.4 km3 for cascade events with energy above 100 TeV generated by neutrino interactions in Lake Baikal. The alarm system in real-time monitoring of the celestial sphere was launched at the beginning of 2021, that allows to form the alerts of two ranks like "muon neutrino" and "VHE cascade". Recent results of fast follow-up searches for coincidences of Baikal-GVD high energy cascades with ANTARES/TAToO high energy neutrino alerts and IceCube GCN messages will be presented, as well as preliminary results of searches for high energy neutrinos in coincidence with the magnetar SGR 1935+2154 activity in period of radio and gamma burst in 2020., Comment: Submitted to Proc. of the 37th International Cosmic Ray Conference (ICRC 2021), PoS-0946, July 12th -- 23rd, 2021, Online -- Berlin, Germany. 8 pages, 5 figures
Published: 2021

39. The Baikal-GVD neutrino telescope as an instrument for studying Baikal water luminescence

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: We present data on the Baikal water luminescence collected with the Baikal-GVD neutrino telescope. This three-dimensional array of photo-sensors allows the observation of time and spatial variations of the ambient light field. We report on annual increase of luminescence activity in years 2018-2020. We observed a unique event of a highly luminescent layer propagating upwards with a maximum speed of 28 m/day for the first time., Comment: Contribution at 37th International Cosmic Ray Conference (ICRC 2021). arXiv admin note: text overlap with arXiv:1908.06509
Published: 2021
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40. Positioning system for Baikal-GVD

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: Baikal-GVD is a kilometer scale neutrino telescope currently under construction in Lake Baikal. Due to water currents in Lake Baikal, individual photomultiplier housings are mobile and can drift away from their initial position. In order to accurately determine the coordinates of the photomultipliers, the telescope is equipped with an acoustic positioning system. The system consists of a network of acoustic modems, installed along the telescope strings and uses acoustic trilateration to determine the coordinates of individual modems. This contribution discusses the current state of the positioning in Baikal-GVD, including the recent upgrade to the acoustic modem polling algorithm., Comment: Presented at 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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41. The Baikal-GVD neutrino telescope: search for high-energy cascades

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: Baikal-GVD is a neutrino telescope currently under construction in Lake Baikal. GVD is formed by multi-meganton subarrays (clusters). The design of Baikal-GVD allows one to search for astrophysical neutrinos already at early phases of the array construction. We present here preliminary results of a search for high-energy neutrinos with GVD in 2019-2020., Comment: Submitted to Proc. of the 37th International Cosmic Ray Conference (ICRC 2021), PoS-1144, July 12th -- 23rd, 2021, Online -- Berlin, Germany. 8 pages, 7 figures
Published: 2021

42. Follow up of the IceCube alerts with the Baikal-GVD telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The high-energy muon neutrino events of the IceCube telescope, that are triggered as neutrino alerts in one of two probability ranks of astrophysical origin, "gold" and "bronze", have been followed up by the Baikal-GVD in a fast quasi-online mode since September 2020. Search for correlations between alerts and GVD events reconstructed in two modes, muon-track and cascades (electromagnetic or hadronic showers), for the time windows $ \pm $ 1 h and $ \pm $ 12 h does not indicate statistically significant excess of the measured events over the expected number of background events. Upper limits on the neutrino fluence will be presented for each alert., Comment: 5 pages, 5 figures, Proceedings for the VLVnT 2021 conference, submitted to JINST
Published: 2021
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43. Automatic data processing for Baikal-GVD neutrino observatory

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: Baikal-GVD is a gigaton-scale neutrino observatory under construction in Lake Baikal. It currently produces about 100 GB of data every day. For their automatic processing, the Baikal Analysis and Reconstruction software (BARS) was developed. At the moment, it includes such stages as hit extraction from PMT waveforms, assembling events from raw data, assigning timestamps to events, determining the position of the optical modules using an acoustic positioning system, data quality monitoring, muon track and cascade reconstruction, as well as the alert signal generation. These stages are implemented as C++ programs which are executed sequentially one after another and can be represented as a directed acyclic graph. The most resource-consuming programs run in parallel to speed up processing. A separate Python package based on the luigi package is responsible for program execution control. Additional information such as the program execution status and run metadata are saved into a central database and then displayed on the dashboard. Results can be obtained several hours after the run completion., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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44. Methods for the suppression of background cascades produced along atmospheric muon tracks in the Baikal-GVD

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD (Gigaton Volume Detector) is a km$^{3}$- scale neutrino telescope located in Lake Baikal. Currently (year 2021) the Baikal-GVD is composed of 2304 optical modules divided to 8 independent detection units, called clusters. Specific neutrino interactions can cause Cherenkov light topology, referred to as a cascade. However, cascade-like events originate from discrete stochastic energy losses along muon tracks. These cascades produce the most abundant background in searching for high-energy neutrino cascade events. Several methods have been developed, optimized, and tested to suppress background cascades., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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45. An efficient hit finding algorithm for Baikal-GVD muon reconstruction

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal-GVD is a large scale neutrino telescope being constructed in Lake Baikal. The majority of signal detected by the telescope are noise hits, caused primarily by the luminescence of the Baikal water. Separating noise hits from the hits produced by Cherenkov light emitted from the muon track is a challenging part of the muon event reconstruction. We present an algorithm that utilizes a known directional hit causality criterion to contruct a graph of hits and then use a clique-based technique to select the subset of signal hits.The algorithm was tested on realistic detector Monte-Carlo simulation for a wide range of muon energies and has proved to select a pure sample of PMT hits from Cherenkov photons while retaining above 90\% of original signal., Comment: Presented at the 37th International Cosmic Ray Conference (ICRC 2021)
Published: 2021
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46. Method and portable bench for tests of the laser optical calibration system components for the Baikal-GVD underwater neutrino Cherenkov telescope

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fialkovski, L. Fajt f S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fialkovski, L. Fajt f S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The large-scale deep underwater Cherenkov neutrino telescopes like Baikal-GVD, ANTARES or KM3NeT, require calibration and testing methods of their optical modules. These methods usually include laser-based systems which allow to check the telescope responses to the light and for real-time monitoring of the optical parameters of water such as absorption and scattering lengths, which show seasonal changes in natural reservoirs of water. We will present a testing method of a laser calibration system and a set of dedicated tools developed for Baikal- GVD, which includes a specially designed and built, compact, portable, and reconfigurable scanning station. This station is adapted to perform fast quality tests of the underwater laser sets just before their deployment in the telescope structure, even on ice, without darkroom. The testing procedure includes the energy stability test of the laser device, 3D scan of the light emission from the diffuser and attenuation test of the optical elements of the laser calibration system. The test bench consists primarily of an automatic mechanical scanner with a movable Si detector, beam splitter with a reference Si detector and, optionally, Q-switched diode-pumped solid-state laser used for laboratory scans of the diffusers. The presented test bench enables a three-dimensional scan of the light emission from diffusers, which are designed to obtain the isotropic distribution of photons around the point of emission. The results of the measurement can be easily shown on a 3D plot immediately after the test and may be also implemented to a dedicated program simulating photons propagation in water, which allows to check the quality of the diffuser in the scale of the Baikal-GVD telescope geometry., Comment: Presented at the VLVnT - Very Large Volume Neutrino Telescope Workshop, Valencia, 18-21 May 2021
Published: 2021
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47. Proposal for fiber optic data acquisition system for Baikal-GVD

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The first stage of the construction of the deep underwater neutrino telescope Baikal-GVD is planned to be completed in 2024. The second stage of the detector deployment is planned to be carried out using a data acquisition system based on fibre optic technologies, which will allow for increased data throughput and more flexible trigger conditions. A dedicated test facility has been built and deployed at the Baikal-GVD site to test the new technological solutions. We present the principles of operation and results of tests of the new data acquisition system., Comment: 4 pages, 1 figure, presented at the Conference VLVnT 2021
Published: 2021
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48. Measuring muon tracks in Baikal-GVD using a fast reconstruction algorithm

Author: Collaboration, Baikal-GVD, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., Zaborov, D. N., Collaboration, Baikal-GVD, Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannasch, R., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Eckerová, E., Elzhov, T. V., Fajt, L., Fialkovski, S. V., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Kopański, K. A., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malecki, Pa., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Naumov, D. V., Nazari, V., Noga, W., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Štekl, I., Stromakov, A. P., Sushenok, E. O., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., Yakovlev, S. A., and Zaborov, D. N.
Abstract: The Baikal Gigaton Volume Detector (Baikal-GVD) is a km$^3$-scale neutrino detector currently under construction in Lake Baikal, Russia. The detector consists of several thousand optical sensors arranged on vertical strings, with 36 sensors per string. The strings are grouped into clusters of 8 strings each. Each cluster can operate as a stand-alone neutrino detector. The detector layout is optimized for the measurement of astrophysical neutrinos with energies of $\sim$ 100 TeV and above. Events resulting from charged current interactions of muon (anti-)neutrinos will have a track-like topology in Baikal-GVD. A fast $\chi^2$-based reconstruction algorithm has been developed to reconstruct such track-like events. The algorithm has been applied to data collected in 2019 from the first five operational clusters of Baikal-GVD, resulting in observations of both downgoing atmospheric muons and upgoing atmospheric neutrinos. This serves as an important milestone towards experimental validation of the Baikal-GVD design. The analysis is limited to single-cluster data, favoring nearly-vertical tracks., Comment: 15 pages, 6 figures, 1 table, to be published in Eur. Phys. J. C
Published: 2021
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49. The Baikal-GVD detector calibration

Author: Collaboration, Baikal-GVD, Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannash, R., Belolaptikov, I. A, Brudanin, V. B., Budnev, N. M., Domogatsky, G. V., Doroshenko, A. A., Dvornicky, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Fajth, L., Fialkovsky, S. V, Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Ivanov, R., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, A. V., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Milenin, M. B., Mirgazov, R. A., Nazari, V., Panfilov, A. I., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rjabov, E. V., Rushay, V. D., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Simkovic, F., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Stekl, I., Suvorova, O. V., Sushenok, E. O., Tabolenko, V. A., Tarashansky, B. A., Yakovlev, S. A., Collaboration, Baikal-GVD, Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannash, R., Belolaptikov, I. A, Brudanin, V. B., Budnev, N. M., Domogatsky, G. V., Doroshenko, A. A., Dvornicky, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Fajth, L., Fialkovsky, S. V, Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Ivanov, R., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, A. V., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Milenin, M. B., Mirgazov, R. A., Nazari, V., Panfilov, A. I., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rjabov, E. V., Rushay, V. D., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Simkovic, F., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Stekl, I., Suvorova, O. V., Sushenok, E. O., Tabolenko, V. A., Tarashansky, B. A., and Yakovlev, S. A.
Abstract: In April 2019, the Baikal-GVD collaboration finished the installation of the fourth and fifth clusters of the neutrino telescope Baikal-GVD. Momentarily, 1440 Optical Modules (OM) are installed in the largest and deepest freshwater lake in the world, Lake Baikal, instrumenting 0.25 cubic km of sensitive volume. The Baikal-GVD is thus the largest neutrino telescope on the Northern Hemisphere. The first phase of the detector construction is going to be finished in 2021 with 9 clusters, 2592 OMs in total, however the already installed clusters are stand-alone units which are independently operational and taking data from their commissioning. Huge number of channels as well as strict requirements for the precision of the time and charge calibration (ns, p.e.) make calibration procedures vital and very complex tasks. The inter cluster time calibration is performed with numerous calibration systems. The charge calibration is carried out with a Single Photo-Electron peak. The various data acquired during the last three years in regular and special calibration runs validate successful performance of the calibration systems and of the developed calibration techniques. The precision of the charge calibration has been improved and the time dependence of the obtained calibration parameters have been cross-checked. The multiple calibration sources verified a 1.5 - 2.0 ns precision of the in-situ time calibrations. The time walk effect has been studied in detail with in situ specialized calibration runs., Comment: Contribution from the Baikal-GVD Collaboration presented at the 36th International Cosmic Ray Conference, Madison, Wisconsin, USA, 24 July - 1 August 2019. Proceeding: PoS-ICRC2019-0878
Published: 2019

50. The Baikal-GVD neutrino telescope: First results of multi-messenger studies

Author: Collaboration, Baikal-GVD, Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannash, R., Belolaptikov, I. A, Brudanin, V. B., Budnev, N. M., Domogatsky, G. V., Doroshenko, A. A., Dvornicky, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Fajth, L., Fialkovsky, S. V, Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Ivanov, R., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, A. V., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Milenin, M. B., Mirgazov, R. A., Nazari, V., Panfilov, A. I., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rjabov, E. V., Rushay, V. D., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Simkovic, F., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Stekl, I., Suvorova, O. V., Sushenok, E. O., Tabolenko, V. A., Tarashansky, B. A., Yakovlev, S. A., Collaboration, Baikal-GVD, Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannash, R., Belolaptikov, I. A, Brudanin, V. B., Budnev, N. M., Domogatsky, G. V., Doroshenko, A. A., Dvornicky, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Fajth, L., Fialkovsky, S. V, Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Ivanov, R., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, A. V., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Milenin, M. B., Mirgazov, R. A., Nazari, V., Panfilov, A. I., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rjabov, E. V., Rushay, V. D., Safronov, G. B., Shaybonov, B. A., Shelepov, M. D., Simkovic, F., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Stekl, I., Suvorova, O. V., Sushenok, E. O., Tabolenko, V. A., Tarashansky, B. A., and Yakovlev, S. A.
Abstract: Multi-messenger astronomy is a powerful tool to study the physical processes driving the non-thermal Universe. A combination of observations in cosmic rays, neutrinos, photons of all wavelengths and gravitational waves is expected. The alert system of the Baikal-GVD detector under construction will allow for a fast, on-line reconstruction of neutrino events recorded by the Baikal-GVD telescope and - if predefined conditions are satisfied - for the formation of an alert message to other communities. The preliminary results of searches for high-energy neutrinos in coincidence with GW170817/GRB170817A using the cascade mode of neutrino detection are discussed. Two Baikal-GVD clusters were operating during 2017. The zenith angle of NGC 4993 at the detection time of the GW170817 was 93.3 degrees. No events spatially coincident with GRB170817A were found. Given the non-detection of neutrino events associated with GW170817, upper limits on the neutrino fluence were established., Comment: Contribution from the Baikal-GVD Collaboration presented at the 36th International Cosmic Ray Conference, Madison, Wisconsin, USA, 24 July - 1 August 2019. Proceeding: PoS-ICRC2019-1013
Published: 2019

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