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1. Probing the Galactic neutrino flux at neutrino energies above 200 TeV with the Baikal Gigaton Volume Detector

Author: Allakhverdyan, V. A., Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., 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., Fomin, V. N., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Kebkal, K. G., Kebkal, V. K., Kharuk, I. V., Khramov, E. V., Kleimenov, M. I., Kolbin, M. M., Koligaev, S. O., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kozhin, V. A., Kruglov, M. V., Kulepov, V. F., Kulikov, A. A., Lemeshev, Y. E., Mirgazov, R. R., Naumov, D. V., Nikolaev, A. S., Perevalova, I. A., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Ryabov, E. V., Safronov, G. B., Shaybonov, B. A., Shishkin, V. Y., 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., Tretjak, V. I., Ulzutuev, B. B., Yablokova, Y. V., Zaborov, D. N., Zavyalov, S. I., Zvezdov, D. Y., Kovalev, Y. Y., Plavin, A. V., Semikoz, D. V., and Troitsky, S. V.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: Recent observations of the Galactic component of the high-energy neutrino flux, together with the detection of the diffuse Galactic gamma-ray emission up to sub-PeV energies, open new possibilities to study the acceleration and propagation of cosmic rays in the Milky Way. At the same time, both large non-astrophysical backgrounds at TeV energies and scarcity of neutrino events in the sub-PeV band currently limit these analyses. Here we use the sample of cascade events with estimated neutrino energies above 200 TeV, detected by the partially deployed Baikal Gigaton Volume Detector (GVD) in six years of operation, to test the continuation of the Galactic neutrino spectrum to sub-PeV energies. We find that the distribution of the arrival directions of Baikal-GVD cascades above 200 TeV in the sky suggests an excess of neutrinos from low Galactic latitudes. We find the excess above 200 TeV also in the most recent IceCube public data sets, both of cascades and tracks. The significant (3.6 sigma in the combined analysis) flux of Galactic neutrinos above 200 TeV challenges often-used templates for neutrino search based on cosmic-ray simulations., Comment: 7 pages, 5 figures, revtex 4.2
Published: 2024

2. 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., and Zvezdov, D. Y.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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

3. 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., and Zvezdov, D. Y.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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4. 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., and Zvezdov, D. Y.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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5. 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., and Zvezdov, D. Y.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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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., and Troitsky, S. V.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
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. 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., and Zvezdov, D. Y.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, High Energy Physics - Phenomenology
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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8. 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., and Zvezdov, D. Y.
Subjects: High Energy Physics - Phenomenology
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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9. 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., and Zvezdov, D. Y.
Subjects: High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
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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10. 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., and Zvezdov, D. Y.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors, 85
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

11. 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., and Zvezdov, D. Y.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
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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12. 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., and Troitsky, S. V.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
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

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., and Troitsky, S. V.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Astrophysics of Galaxies
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., and Zaborov, D. N.
Subjects: High Energy Physics - Experiment, Physics - Instrumentation and Detectors
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., and Zaborov, D. N.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
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. The Baikal-GVD Neutrino Telescope: Current Status and Development Prospects

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., and Zvezdov, D. Y.
Published: 2023
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17. The Baikal-GVD Neutrino Telescope: Recent Results

Author: Dzhilkibaev, Zh.-A. M., 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., 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.
Published: 2023
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18. Increasing the Sensitivity of the Baikal-GVD Neutrino Telescope Using External Strings of Optical Modules

Author: Avrorin, A. V., Avrorin, A. D., Aynutdinov, V. M., Allakhverdyan, V. A., Bardaćhová, Z., Belolaptikov, I. A., Borina, I. V., Budnev, N. M., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Dvornicky, R., Dzhilkibaev, Zh.-A. M., Dik, V. Y., Domogatsky, G. V., Doroshenko, A. A., Dyachok, A. N., Elzhov, T. V., Zaborov, D. N., Kebkal, V. K., Kebkal, K. G., Kozhin, V. A., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malyshkin, Y. M., Milenin, M. B., Mirgazov, R. R., Nazari, V., Naumov, D. V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Seitova, D., Sirenko, A. E., Skurikhin, A. V., Solovje, A. G., Sorokovikov, M. N., Stromakov, A. P., Suvorov, O. V., Tabolenko, V. A., Taraschansky, B. A., Fajt, L., Khatun, A., Khramov, E. V., Shaybonov, B. A., Shelepov, M. D., Simkovic, F., Šteckl, I., Eckerová, E., and Yablokova, Y. V.
Published: 2023
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19. Chorology of Spalax arenarius, an endemic rodent species of the Lower Dnipro Sands and Taurida steppe

Author: Igor Zagorodniuk and Marina Korobchenko
Subjects: mole rat, spalax arenarius, endemic species, chorology, southern ukraine, Zoology, QL1-991
Abstract: The article analyses one of the most unique species of mammals in the fauna of Ukraine—the fossorial rodent Spalax arenarius. The sandy mole rat is an endemic of the Ukrainian Black Sea region, one of the two endemic species in the mammal fauna of Ukraine and also a species having the smallest geographic range among representatives of the East European mammal fauna. The specifics of the modern distribution of this species, its morphological features and differences from the neighbouring species, from which it can be considered a derivative, are analysed. Particular attention is paid to five aspects of the chorological analysis: 1) description of the current distribution with a detailed map of the species’ occurrence; 2) analysis of ancient Spalax specimens and the former distribution of this species based on actual data; 3) determination of the actual range boundaries, primarily along the land, i.e. in the east of its distribution, 4) analysis of the probable reasons for the range restriction from the west as a probably recent expansion to the region; and 5) construction of a model of the formation of the current range based on reconstructions of the distribution of Spalax in the Taurida Steppe. The latter was carried out considering the morphological features of Spalax arenarius, which are most similar to those of Spalax giganteus, whose modern range is limited to the Caspian Sea regions and, apparently, the North Caucasus. According to morphology and habitat reconstructions, the sandy mole rat is most likely a sister species to Spalax giganteus and one of the source forms for the western S. zemni (similar to the history of ground squirrels). The unique features of the Lower Dnipro population are presented, including the colouration of the feet and rhinaria and the structure of the skull. The history of the Lower Dnipro settlement is considered in view of the regular flooding of the region in historical times (including the flood of 2022). The hypothesis of a recent (possibly secondary) expansion of the species into the region and the specifics of its presence and absence in other neighbouring territories, in particular in the Crimea, Syvash, and the Molochnyi Estuary area, are formulated and considered. The sands zone is most likely the area of recent expansion of the species, which demonstrates a correspondence to the entire complex of Lower Dnipro isolates, including Microtus socialis, Sylvaemus witherbyi, and Scirtopoda telum.
Published: 2023
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20. 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., and Zaborov, D. N.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
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

21. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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22. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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23. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Data Analysis, Statistics and Probability
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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24. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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25. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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26. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Physics - Instrumentation and Detectors
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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27. 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., and Zaborov, D. N.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
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

28. 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., and Zaborov, D. N.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
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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29. 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., and Zaborov, D. N.
Subjects: High Energy Physics - Phenomenology, Astrophysics - High Energy Astrophysical Phenomena
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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30. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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31. 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., and Zaborov, D. N.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Instrumentation and Detectors
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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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., and Zaborov, D. N.
Subjects: High Energy Physics - Experiment, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
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. Results from Reconstructing a Neutrino in the Track Channel at the Deep-Water BAIKAL-GVD Telescope

Author: Avrorin, A. V., Avrorin, A. D., Aynutdinov, V. M., Allakhverdyan, V. A., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Budnev, N. M., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Dvornický, R., Dzhilkibaev, Zh.-A. M., Dik, V. Ya., Domogatsky, G. V., Doroshenko, A. A., Dyachok, A. N., Elzhov, T. V., Zaborov, D. N., Kebkal, V. K., Kebkal, K. G., Kozhin, V. A., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malyshkin, Yu. M., Milenin, M. B., Mirgazov, R. R., Nazari, V., Naumov, D. V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Seitova, D., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Fajt, L., Khatun, A., Khramov, E. V., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Štekl, I., Eckerová, E., and Yablokova, Y. V.
Published: 2023
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34. Status of the Baikal-GVD Neutrino Telescope and Main Results

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., Kryukov, M. K., 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., Seitova, D., 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., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Yablokova, Y. V., and Zaborov, D. N.
Published: 2023
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35. Conservation of rodents ex situ: experience of keeping the northern mole vole (Ellobius talpinus) in captivity

Author: Marina Korobchenko
Subjects: northern mole vole, ellobius talpinus, conservation ex situ, captivity, Zoology, QL1-991
Abstract: The article presents data on the biology of Ellobius talpinus kept in captivity. The creation of semi-underground conditions in terrarium and long-term observations of a group of vole moles during 2003–2014 are described. The course of the life cycle of these animals in the terrarium is presented: daily and seasonal activity, burrowing activity, diet and food preferences, and reproduction. It has been revealed that in captivity mole voles change their daily activity on the surface from crepuscular to diel, which is associated with the absence of disturbance factors or sudden changes in temperature and light. Seasonal activity in captivity is not pronounced, represented by two cases of reproduction that occurred in the summer months. The burrowing activity is extremely high; mole voles burrow or clean the passages daily and often with every activity, without any particular need, demonstrating a stereotypical form of behaviour. Social behaviour, specifics of communication between individuals, and vocalisation are described. It has been noted that the vole moles are characterised by high communication activity, both tactile when adults contact each other and when exploring the environment. Cases of special high-frequency vocalisation such as ‘grinding’ directed not towards another individual, but to the corners of the terrarium, where the mole voles were searching for the possibility of making passages, were repeatedly observed and recorded on video. The following aspects of behaviour were also analysed: reaction to the observer, new conditions, disturbances, and features of group behaviour, including aggression, joint rest, and feeding. Mole voles consumed food both where it was placed and in their chambers, but most often in the chambers there were attempts to create stocks. They preferred roots and bulbs of cultivated plants. The experience of forming reproducing pairs was gained, which allowed us to study the course of pregnancy and the development and growth of the newborn and young. The appearance and condition of the newborn are described along with the presence of teeth, the time when the eyes open, the process of feeding and weaning, growth and weight gain, the ability to move and burrow, and features of parental care. The experience gained demonstrates both the possibility of introduction of the species and the formation of reserve groups to restore lost natural populations.
Published: 2023
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36. Tracking IceCube Neutrino Alerts with the Deep-Water BAIKAL-GVD Telescope

Author: Avrorin, A. V., Avrorin, A. D., Aynutdinov, V. M., Allakhverdyan, V. A., Bardačová, Z., Belolaptikov, I. A., Borina, I. V., Budnev, N. M., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gress, T. I., Dvornický, R., Dzhilkibaev, Zh.-A. M., Dik, V. Ya., Domogatsky, G. V., Doroshenko, A. A., Dyachok, A. N., Elzhov, T. V., Zaborov, D. N., Kebkal, V. K., Kebkal, K. G., Kozhin, V. A., Kolbin, M. M., Konischev, K. V., Korobchenko, A. V., Koshechkin, A. P., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Malyshkin, Yu. M., Milenin, M. B., Mirgazov, R. R., Nazari, V., Naumov, D. V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Seitova, D., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Stromakov, A. P., Suvorova, O. V., Tabolenko, V. A., Tarashansky, B. A., Fajt, L., Khatun, A., Khramov, E. V., Shaybonov, B. A., Shelepov, M. D., Šimkovic, F., Štekl, I., Eckerová, E., and Yablokova, Y. V.
Published: 2023
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37. Mathematical and informational support of decision-making in risk management of cross-border high technology projects

Author: Batova, Marina, primary, Baranova, Irina, additional, Baranov, Vyacheslav, additional, Mayorov, Sergey, additional, Korobchenko, Oleg, additional, and Zhao, Kai, additional
Published: 2023
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38. Data Quality Monitoring system in the Baikal-GVD experiment

Author: Collaboratio, 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.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: The quality of the incoming experimental data has a significant importance for both analysis and running the experiment. The main point of the Baikal-GVD DQM system is to monitor the status of the detector and obtained data on the run-by-run based analysis. It should be fast enough to be able to provide analysis results to detector shifter and for participation in the global multi-messaging system., 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-ICRC2019-0874
Published: 2019

39. The optical noise monitoring systems of Lake Baikal environment for the Baikal-GVD telescope

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., and Yakovlev, S. A.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: We present data on the luminescence of the Baikal water medium collected with the Baikal-GVD neutrino telescope. This three-dimensional array of light sensors allows the observation of time and spatial variations of the ambient light field. We report on observation of an increase of luminescence activity in 2016 and 2018. On the contrary, we observed practically constant optical noise in 2017. An agreement has been found between two independent optical noise data sets. These are data collected with online monitoring system and the trigger system of the cluster., 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-ICRC2019-0875
Published: 2019

40. The inter-cluster time synchronization systems within the Baikal-GVD detector

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., and Yakovlev, S. A.
Subjects: Physics - Instrumentation and Detectors, Astrophysics - High Energy Astrophysical Phenomena
Abstract: Currently in Lake Baikal, a new generation neutrino telescope is being deployed: the deep underwater Cherenkov detector of a cubic-kilometer scale Baikal-GVD. Completion of the first stage of the telescope construction is planned for 2021 with the implementation of 9 clusters. Each cluster is a completely independent unit in all the aspects: triggering, calibration, data transfer, etc. A high-energy particle might leave its trace in more than a single cluster. To be able to merge events caused by such a particle in more clusters, the appropriate inter-cluster time synchronization is vital., 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-ICRC2019-0877
Published: 2019

41. A positioning system for Baikal-GVD

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., and Yakovlev, S. A.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: A cubic kilometer scale neutrino telescope Baikal-GVD is currently under construction in Lake Baikal. Baikal-GVD is designed to detect Cerenkov radiation from products of astrophysical neutrino interactions with Baikal water by a lattice of photodetectors submerged between the depths of 1275 and 730 m. The detector components are mounted on flexible strings and can drift from their initial positions upwards to tens of meters. This introduces positioning uncertainty which translates into a timing error for Cerenkov signal registration. A spatial positioning system has been developed to resolve this issue. In this contribution, we present the status of this system, results of acoustic measurements and an estimate of positioning error for an individual component., 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-ICRC2019-1012
Published: 2019

42. 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., and Yakovlev, S. A.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Physics - Instrumentation and Detectors
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

43. 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., and Yakovlev, S. A.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
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

44. Search for cascade events with Baikal-GVD

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., and Yakovlev, S. A.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: Baikal-GVD is a next generation, kilometer-scale neutrino telescope currently under construction in Lake Baikal. GVD is formed by multi-megaton sub-arrays (clusters) and is designed for the detection of astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. The design of the Baikal-GVD allows one to search for astrophysical neutrinos with flux values measured by IceCube already at early phases of the array construction. We present here preliminary results of the search for high-energy neutrinos via the cascade mode with the Baikal-GVD neutrino telescope., 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-ICRC2019-0873
Published: 2019

45. Neutrino Telescope in Lake Baikal: Present and Future

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., and Yakovlev, S. A.
Subjects: Astrophysics - High Energy Astrophysical Phenomena
Abstract: A significant progress in the construction and operation of the Baikal Gigaton Volume Detector in Lake Baikal, the largest and deepest freshwater lake in the world, is reported. The effective volume of the detector for neutrino initiated cascades of relativistic particles with energy above 100 TeV has been increased up to about 0.25 cubic kilometer. This unique scientific facility, the largest operating neutrino telescope in Northern Hemisphere, allows already to register two to three events per year from astrophysical neutrinos with energies exceeding 100 TeV. Preliminary results obtained with data recorded in 2016-2018 are announced. Multimessenger approach is used to relate finding of cosmic neutrinos with those of classical astronomers, with X-ray or gamma-ray observations and the gravitational wave events., 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-ICRC2019-1011
Published: 2019

46. Search for high-energy neutrinos from GW170817 with Baikal-GVD neutrino telescope

Author: Collaboration, Baikal-GVD, Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannash, R., Belolaptikov, I. A., Brudanin, V. B., Budnev, N. M., Doroshenko, A. A., Domogatsky, G. V., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Fajt, L., Fialkovsky, S. V., Gafarov, A. R., Golubkov, K. V., Gres, T. I., Honz, Z., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. P., Koshechkin, A. P., Kozhin, V. A., Kulepov, V. F., Kuleshov, D. A., Milenin, M. B., Mirgazov, R. A., Osipova, E. R., Panfilov, A. I., Pan'kov, L. V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rjabov, E. V., Rushay, V. D., Safronov, G. B., Simkovic, F., Skurkhin, A. V., Shoibonov, B. A., Solovjev, A. G., Sorokovikov, M. N., Shelepov, M. D., Suvorova, O. V., Shtekl, I., Tabolenko, V. A., Tarashansky, B. A., Yakovlev, S. A., Zagorodnikov, A. V., and Zurbanov, V. L.
Subjects: Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment
Abstract: The Advanced LIGO and Advanced Virgo observatories recently discovered gravitational waves from a binary neutron star inspiral. A short gamma-ray burst (GRB) that followed the merger of this binary was also recorded by Fermi-GBM and INTEGRAL, indicating particle acceleration by the source. The precise location of the event was determined by optical detections of emission following the merger. We searched for high-energy neutrinos from the merger in the TeV - 100 PeV energy range using Baikal-GVD. No neutrinos directionally coincident with the source were detected within $\pm$500 s around the merger time, as well as during a 14-day period after the GW detection. We derived 90% confidence level upper limits on the neutrino fluence from GW170817 during a $\pm$500 s window centered on the GW trigger time, and a 14-day window following the GW signal under the assumption of an $E^{-2}$ neutrino energy spectrum., Comment: 4 pages, 4 figures
Published: 2018

47. Baikal-GVD: status and prospects

Author: Collaboration, Baikal-GVD, Avrorin, A. D., Avrorin, A. V., Aynutdinov, V. M., Bannash, R., Belolaptikov, I. A., Brudanin, V. B., Budnev, N. M., Doroshenko, A. A., Domogatsky, G. V., Dvornický, R., Dyachok, A. N., Dzhilkibaev, Zh. -A. M., Fajt, L., Fialkovsky, S. V., Gafarov, A. R., Golubkov, K. V., Gres, T. I., Honz, Z., Kebkal, K. G., Kebkal, O. G., Khramov, E. V., Kolbin, M. M., Konischev, K. V., Korobchenko, A. P., Koshechkin, A. P., Kozhin, V. A., Kulepov, V. F., Kuleshov, D. A., Milenin, M. B., Mirgazov, R. A., Osipova, E. R., Panfilov, A. I., Pan'kov, L. V., Petukhov, D. P., Pliskovsky, E. N., Rozanov, M. I., Rjabov, E. V., Rushay, V. D., Safronov, G. B., Simkovic, F., Shoibonov, B. A., Solovjev, A. G., Sorokovikov, M. N., Shelepov, M. D., Suvorova, O. V., Shtekl, I., Tabolenko, V. A., Tarashansky, B. A., Yakovlev, S. A., Zagorodnikov, A. V., and Zurbanov, V. L.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract: Baikal-GVD is a next generation, kilometer-scale neutrino telescope under construction in Lake Baikal. It is designed to detect astrophysical neutrino fluxes at energies from a few TeV up to 100 PeV. GVD is formed by multi-megaton subarrays (clusters). The array construction started in 2015 by deployment of a reduced-size demonstration cluster named "Dubna". The first cluster in its baseline configuration was deployed in 2016, the second in 2017 and the third in 2018. The full scale GVD will be an array of ~10000 light sensors with an instrumented volume of about 2 cubic km. The first phase (GVD-1) is planned to be completed by 2020-2021. It will comprise 8 clusters with 2304 light sensors in total. We describe the design of Baikal-GVD and present selected results obtained in 2015-2017., Comment: 9 pages, 8 figures. Conference proceedings for QUARKS2018
Published: 2018

48. Dynamics of spatial distribution, burrowing activity, and foraging of the greater blind mole rat (Spalax microphthalmus)

Author: Marina Korobchenko
Subjects: mole rat, spatial distribution, foraging behaviour, food storage, ukraine, Zoology, QL1-991
Abstract: Original data on the burrowing and foraging activities of the greater blind mole rat (Spalax microphthalmus), which is distributed in the east of Ukraine, are generalised. The population density of this species depends directly on the amount of available food resources at respective sites. The strategy of food storage forms according to the amount and type of available plant resources and depending on the preservation of natural habitat of mole rats. Their appearance in gardens and homesteads is related to anthropogenic changes of the environment at the dwelling sites of mole rats. The seasonal dynamics of their burrowing activity is well pronounced and includes the creation of a branching system of tunnels in the period of active vegetation of plants as well as the relocation or resettlement of animals in various habitats during the year, their lifetime, and population cycle. The length of tunnels, structure of burrows, and the structure of branched underground galleries are regulated by the density and spatial distribution of food resources. Based on the results of our study, specific features of the activity of the greater blind mole rat during various seasons of the year are described, including their active relocation both underground and on the surface, their burrowing at different horizons, the use of a great variety of food and the volumes of their storage for periods when the vegetation of plants ceases. Features of biotopic distribution and food storage of the greater blind mole rat are described in general and in relation to the species’ dispersal into anthropogenically transformed parts of its range, including areas nearby to human settlements. The distribution of food storage chambers is analysed, of both temporal chambers near the surface and deep-lying chambers, the ratio of which is about 3:1. The food storage chambers often contain garden vegetables, although it is related not only to the preferences of mole rats, which are obvious too, but also to the fact that information about the storage chambers (especially deep-lying ones) is usually reported by people combating the mole rats for the stolen harvest. The average volume of low-lying chambers is 5–10 kg (1.0–1.5 buckets), whereas the average volume of deep-lying chambers is 20–30 kg. Data on the content of food storage chambers revealed both in homesteads and natural or nearly natural sites are generalised.
Published: 2022
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49. Deep-Underwater Cherenkov Detector in Lake Baikal

Author: Avrorin, A.V., Avrorin, A. D., Ayinutdinov, V. M., Allakhverdyan, V. A., Banash, P., Bardachova, Z., Belolaptikov, I. A., Borina, I. V., Brudanin, V. B., Budnev, N. M., Gafarov, A. R., Golubkov, K. V., Gorshkov, N. S., Gres’, T. I., Dwornitski, R., Dzhilkibaev, Zh.-A. M., Dik, V. Ya., Domogatskii, G. V., Doroshenko, A. A., Dyachok, A. N., Elzhov, T. V., Zaborov, D. N., Katulin, M. S., Kebkal, K. G., Kebkal, O. G., Kozhin, V. A., Kolbin, M. M., Konishchev, K. V., Kopanski, K. A., Korobchenko, A. V., Koshechkin, A. P., Kruglov, M. V., Kryukov, M. K., Kulepov, V. F., Maletski, P., Malyshkin, Yu. M., Milenin, M. B., Mirgazov, R. R., Nazari, V., Naumov, D. V., Noga, V., Petukhov, D. P., Pliskovskii, E. N., Rozanov, M. I., Rushay, V. D., Ryabov, E. V., Safronov, G. B., Sirenko, A. E., Skurikhin, A. V., Solovjev, A. G., Sorokovikov, M. N., Stromakov, A. P., Suvorova, O. V., Sushenok, E. O., Tabolenko, V. A., Tarashchanskii, B. A., Fait, L., Fialkovskii, S. V., Khramov, E. V., Shaibonov, B. A., Shelepov, M. D., Šimkovic, F., Stekl, I., Etskerova, E., Yablokova, Yu. V., and Yakovlev, S. A.
Published: 2022
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50. Legislative Provisions Underlying Trade Unions' Right to Define Their Organizational Structure

Author: Korobchenko, Victoria V., Penov, Yury V., and Safonov, Valery A.
Abstract: The article contains a comparative analysis of constitutional and other legislative provisions that ensure a trade union's right to define its own administrative structure in European states. The aim of the study is to reveal the management's problems of European trade unions, declarative and empirical mass-character legislative provisions, which allow to structure trade unions by themselves. The result is that the state should not set forth an exhaustive list of various types of trade unions. The article also examines the authority of trade union associations to define the requirements imposed on their members' charters. These requirements are argued to comply with the principle of the freedom of association. Moreover, the work reveals that many European legislative provisions are declarated but rarely realized in sphere of inner management. The novelty of the research is the comparative analytic review, basing on the modern local and collective European laws.
Published: 2016

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