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1. AGILE Observations of GRB 220101A: A “New Year's Burst” with an Exceptionally Huge Energy Release.

Author

Ursi, A., Romani, M., Piano, G., Verrecchia, F., Longo, F., Pittori, C., Tavani, M., Bulgarelli, A., Cardillo, M., Casentini, C., Cattaneo, P. W., Costa, E., Feroci, M., Fioretti, V., Foffano, L., Lucarelli, F., Marisaldi, M., Morselli, A., Pacciani, L., and Parmiggiani, N.

Subjects
GAMMA ray bursts, LUMINOSITY
Abstract

We report the AGILE observations of GRB 220101A, which took place at the beginning of 2022 January 1 and was recognized as one of the most energetic gamma-ray bursts (GRBs) ever detected since their discovery. The AGILE satellite acquired interesting data concerning the prompt phase of this burst, providing an overall temporal and spectral description of the event in a wide energy range, from tens of kiloelectronvolts to tens of megaelectronvolts. Dividing the prompt emission into three main intervals, we notice an interesting spectral evolution, featuring a notable hardening of the spectrum in the central part of the burst. The average fluxes encountered in the different time intervals are relatively moderate, with respect to those of other remarkable bursts, and the overall fluence exhibits a quite ordinary value among the GRBs detected by MCAL. However, GRB 220101A is the second farthest event detected by AGILE, and the burst with the highest isotropic equivalent energy of the entire MCAL GRB sample, releasing E iso = 2.54 Ă— 1054 erg and exhibiting an isotropic luminosity of L iso = 2.34 Ă— 1052 erg sâˆ'1 (both in the 400 keVâ€"10 MeV energy range). We also analyzed the first 106 s of the afterglow phase, using the publicly available Swift-XRT data, carrying out a theoretical analysis of the afterglow, based on the forward shock model. We notice that GRB 220101A is with high probability surrounded by a wind-like density medium, and that the energy carried by the initial shock shall be a fraction of the total E iso, presumably near ∼50%. [ABSTRACT FROM AUTHOR]

Published
2022
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2. Sensitivity of the Cherenkov Telescope Array for probing cosmology and fundamental physics with gamma-ray propagation

Author

Abdalla, H., primary, Abe, H., additional, Acero, F., additional, Acharyya, A., additional, Adam, R., additional, Agudo, I., additional, Aguirre-Santaella, A., additional, Alfaro, R., additional, Alfaro, J., additional, Alispach, C., additional, Aloisio, R., additional, Batista, R. Alves, additional, Amati, L., additional, Amato, E., additional, Ambrosi, G., additional, Angüner, E.O., additional, Araudo, A., additional, Armstrong, T., additional, Arqueros, F., additional, Arrabito, L., additional, Asano, K., additional, Ascasíbar, Y., additional, Ashley, M., additional, Backes, M., additional, Balazs, C., additional, Balbo, M., additional, Balmaverde, B., additional, Larriva, A. Baquero, additional, Martins, V. Barbosa, additional, Barkov, M., additional, Baroncelli, L., additional, de Almeida, U. Barres, additional, Barrio, J.A., additional, Batista, P.-I., additional, González, J. Becerra, additional, Becherini, Y., additional, Beck, G., additional, Tjus, J. Becker, additional, Belmont, R., additional, Benbow, W., additional, Bernardini, E., additional, Berti, A., additional, Berton, M., additional, Bertucci, B., additional, Beshley, V., additional, Bi, B., additional, Biasuzzi, B., additional, Biland, A., additional, Bissaldi, E., additional, Biteau, J., additional, Blanch, O., additional, Bocchino, F., additional, Boisson, C., additional, Bolmont, J., additional, Bonanno, G., additional, Arbeletche, L. Bonneau, additional, Bonnoli, G., additional, Bordas, P., additional, Bottacini, E., additional, Böttcher, M., additional, Bozhilov, V., additional, Bregeon, J., additional, Brill, A., additional, Brown, A.M., additional, Bruno, P., additional, Bruno, A., additional, Bulgarelli, A., additional, Burton, M., additional, Buscemi, M., additional, Caccianiga, A., additional, Cameron, R., additional, Capasso, M., additional, Caprai, M., additional, Caproni, A., additional, Capuzzo-Dolcetta, R., additional, Caraveo, P., additional, Carosi, R., additional, Carosi, A., additional, Casanova, S., additional, Cascone, E., additional, Cauz, D., additional, Cerny, K., additional, Cerruti, M., additional, Chadwick, P., additional, Chaty, S., additional, Chen, A., additional, Chernyakova, M., additional, Chiaro, G., additional, Chiavassa, A., additional, Chytka, L., additional, Conforti, V., additional, Conte, F., additional, Contreras, J.L., additional, Coronado-Blazquez, J., additional, Cortina, J., additional, Costa, A., additional, Costantini, H., additional, Covino, S., additional, Cristofari, P., additional, Cuevas, O., additional, D'Ammando, F., additional, Daniel, M.K., additional, Davies, J., additional, Dazzi, F., additional, Angelis, A. De, additional, de Lavergne, M. de Bony, additional, Caprio, V. De, additional, Anjos, R. de Cássia dos, additional, Pino, E.M. de Gouveia Dal, additional, Lotto, B. De, additional, Martino, D. De, additional, de Naurois, M., additional, Wilhelmi, E. de Oña, additional, Palma, F. De, additional, de Souza, V., additional, Delgado, C., additional, Ceca, R. Della, additional, Volpe, D. della, additional, Depaoli, D., additional, Girolamo, T. Di, additional, Pierro, F. Di, additional, Díaz, C., additional, Díaz-Bahamondes, C., additional, Diebold, S., additional, Djannati-Ataï, A., additional, Dmytriiev, A., additional, Domínguez, A., additional, Donini, A., additional, Dorner, D., additional, Doro, M., additional, Dournaux, J., additional, Dwarkadas, V.V., additional, Ebr, J., additional, Eckner, C., additional, Einecke, S., additional, Ekoume, T.R.N., additional, Elsässer, D., additional, Emery, G., additional, Evoli, C., additional, Fairbairn, M., additional, Falceta-Goncalves, D., additional, Fegan, S., additional, Feng, Q., additional, Ferrand, G., additional, Fiandrini, E., additional, Fiasson, A., additional, Fioretti, V., additional, Foffano, L., additional, Fonseca, M.V., additional, Font, L., additional, Fontaine, G., additional, Franco, F.J., additional, Coromina, L. Freixas, additional, Fukami, S., additional, Fukazawa, Y., additional, Fukui, Y., additional, Gaggero, D., additional, Galanti, G., additional, Gammaldi, V., additional, Garcia, E., additional, Garczarczyk, M., additional, Gascon, D., additional, Gaug, M., additional, Gent, A., additional, Ghalumyan, A., additional, Ghirlanda, G., additional, Gianotti, F., additional, Giarrusso, M., additional, Giavitto, G., additional, Giglietto, N., additional, Giordano, F., additional, Glicenstein, J., additional, Goldoni, P., additional, González, J.M., additional, Gourgouliatos, K., additional, Grabarczyk, T., additional, Grandi, P., additional, Granot, J., additional, Grasso, D., additional, Green, J., additional, Grube, J., additional, Gueta, O., additional, Gunji, S., additional, Halim, A., additional, Harvey, M., additional, Collado, T. Hassan, additional, Hayashi, K., additional, Heller, M., additional, Cadena, S. Hernández, additional, Hervet, O., additional, Hinton, J., additional, Hiroshima, N., additional, Hnatyk, B., additional, Hnatyk, R., additional, Hoffmann, D., additional, Hofmann, W., additional, Holder, J., additional, Horan, D., additional, Hörandel, J., additional, Horvath, P., additional, Hovatta, T., additional, Hrabovsky, M., additional, Hrupec, D., additional, Hughes, G., additional, Hütten, M., additional, Iarlori, M., additional, Inada, T., additional, Inoue, S., additional, Insolia, A., additional, Ionica, M., additional, Iori, M., additional, Jacquemont, M., additional, Jamrozy, M., additional, Janecek, P., additional, Martínez, I. Jiménez, additional, Jin, W., additional, Jung-Richardt, I., additional, Jurysek, J., additional, Kaaret, P., additional, Karas, V., additional, Karkar, S., additional, Kawanaka, N., additional, Kerszberg, D., additional, Khélifi, B., additional, Kissmann, R., additional, Knödlseder, J., additional, Kobayashi, Y., additional, Kohri, K., additional, Komin, N., additional, Kong, A., additional, Kosack, K., additional, Kubo, H., additional, Palombara, N. La, additional, Lamanna, G., additional, Lang, R.G., additional, Lapington, J., additional, Laporte, P., additional, Lefaucheur, J., additional, Lemoine-Goumard, M., additional, Lenain, J., additional, Leone, F., additional, Leto, G., additional, Leuschner, F., additional, Lindfors, E., additional, Lloyd, S., additional, Lohse, T., additional, Lombardi, S., additional, Longo, F., additional, Lopez, A., additional, López, M., additional, López-Coto, R., additional, Loporchio, S., additional, Lucarelli, F., additional, Luque-Escamilla, P.L., additional, Lyard, E., additional, Maggio, C., additional, Majczyna, A., additional, Makariev, M., additional, Mallamaci, M., additional, Mandat, D., additional, Maneva, G., additional, Manganaro, M., additional, Manicò, G., additional, Marcowith, A., additional, Marculewicz, M., additional, Markoff, S., additional, Marquez, P., additional, Martí, J., additional, Martinez, O., additional, Martínez, M., additional, Martínez, G., additional, Martínez-Huerta, H., additional, Maurin, G., additional, Mazin, D., additional, Mbarubucyeye, J.D., additional, Miranda, D. Medina, additional, Meyer, M., additional, Micanovic, S., additional, Miener, T., additional, Minev, M., additional, Miranda, J.M., additional, Mitchell, A., additional, Mizuno, T., additional, Mode, B., additional, Moderski, R., additional, Mohrmann, L., additional, Molina, E., additional, Montaruli, T., additional, Moralejo, A., additional, Merino, J. Morales, additional, Morcuende-Parrilla, D., additional, Morselli, A., additional, Mukherjee, R., additional, Mundell, C., additional, Murach, T., additional, Muraishi, H., additional, Nagai, A., additional, Nakamori, T., additional, Nemmen, R., additional, Niemiec, J., additional, Nieto, D., additional, Nievas, M., additional, Nikolajuk, M., additional, Nishijima, K., additional, Noda, K., additional, Nosek, D., additional, Nozaki, S., additional, O'Brien, P., additional, Ohira, Y., additional, Ohishi, M., additional, Oka, T., additional, Ong, R.A., additional, Orienti, M., additional, Orito, R., additional, Orlandini, M., additional, Orlando, E., additional, Osborne, J.P., additional, Ostrowski, M., additional, Oya, I., additional, Pagliaro, A., additional, Palatka, M., additional, Paneque, D., additional, Pantaleo, F.R., additional, Paredes, J.M., additional, Parmiggiani, N., additional, Patricelli, B., additional, Pavletić, L., additional, Pe'er, A., additional, Pech, M., additional, Pecimotika, M., additional, Peresano, M., additional, Persic, M., additional, Petruk, O., additional, Pfrang, K., additional, Piatteli, P., additional, Pietropaolo, E., additional, Pillera, R., additional, Pilszyk, B., additional, Pimentel, D., additional, Pintore, F., additional, Pita, S., additional, Pohl, M., additional, Poireau, V., additional, Polo, M., additional, Prado, R.R., additional, Prast, J., additional, Principe, G., additional, Produit, N., additional, Prokoph, H., additional, Prouza, M., additional, Przybilski, H., additional, Pueschel, E., additional, Pühlhofer, G., additional, Pumo, M.L., additional, Punch, M., additional, Queiroz, F., additional, Quirrenbach, A., additional, Rando, R., additional, Razzaque, S., additional, Rebert, E., additional, Recchia, S., additional, Reichherzer, P., additional, Reimer, O., additional, Reimer, A., additional, Renier, Y., additional, Reposeur, T., additional, Rhode, W., additional, Ribeiro, D., additional, Ribó, M., additional, Richtler, T., additional, Rico, J., additional, Rieger, F., additional, Rizi, V., additional, Rodriguez, J., additional, Fernandez, G. Rodriguez, additional, Ramirez, J.C. Rodriguez, additional, Vázquez, J.J. Rodríguez, additional, Romano, P., additional, Romeo, G., additional, Roncadelli, M., additional, Rosado, J., additional, de Leon, A. Rosales, additional, Rowell, G., additional, Rudak, B., additional, Rujopakarn, W., additional, Russo, F., additional, Sadeh, I., additional, Saha, L., additional, Saito, T., additional, Greus, F. Salesa, additional, Sanchez, D., additional, Sánchez-Conde, M., additional, Sangiorgi, P., additional, Sano, H., additional, Santander, M., additional, Santos, E.M., additional, Sanuy, A., additional, Sarkar, S., additional, Saturni, F.G., additional, Sawangwit, U., additional, Scherer, A., additional, Schleicher, B., additional, Schovanek, P., additional, Schussler, F., additional, Schwanke, U., additional, Sciacca, E., additional, Scuderi, S., additional, Arroyo, M. Seglar, additional, Sergijenko, O., additional, Servillat, M., additional, Seweryn, K., additional, Shalchi, A., additional, Sharma, P., additional, Shellard, R.C., additional, Siejkowski, H., additional, Sinha, A., additional, Sliusar, V., additional, Slowikowska, A., additional, Sokolenko, A., additional, Sol, H., additional, Specovius, A., additional, Spencer, S., additional, Spiga, D., additional, Stamerra, A., additional, Stanič, S., additional, Starling, R., additional, Stolarczyk, T., additional, Straumann, U., additional, Strišković, J., additional, Suda, Y., additional, Świerk, P., additional, Tagliaferri, G., additional, Takahashi, H., additional, Takahashi, M., additional, Tavecchio, F., additional, Taylor, L., additional, Tejedor, L.A., additional, Temnikov, P., additional, Terrier, R., additional, Terzic, T., additional, Testa, V., additional, Tian, W., additional, Tibaldo, L., additional, Tonev, D., additional, Torres, D.F., additional, Torresi, E., additional, Tosti, L., additional, Tothill, N., additional, Tovmassian, G., additional, Travnicek, P., additional, Truzzi, S., additional, Tuossenel, F., additional, Umana, G., additional, Vacula, M., additional, Vagelli, V., additional, Valentino, M., additional, Vallage, B., additional, Vallania, P., additional, Eldik, C. van, additional, Varner, G.S., additional, Vassiliev, V., additional, Acosta, M. Vázquez, additional, Vecchi, M., additional, Veh, J., additional, Vercellone, S., additional, Vergani, S., additional, Verguilov, V., additional, Vettolani, G.P., additional, Viana, A., additional, Vigorito, C.F., additional, Vitale, V., additional, Vorobiov, S., additional, Vovk, I., additional, Vuillaume, T., additional, Wagner, S.J., additional, Walter, R., additional, Watson, J., additional, White, M., additional, White, R., additional, Wiemann, R., additional, Wierzcholska, A., additional, Will, M., additional, Williams, D.A., additional, Wischnewski, R., additional, Wolter, A., additional, Yamazaki, R., additional, Yanagita, S., additional, Yang, L., additional, Yoshikoshi, T., additional, Zacharias, M., additional, Zaharijas, G., additional, Zaric, D., additional, Zavrtanik, M., additional, Zavrtanik, D., additional, Zdziarski, A.A., additional, Zech, A., additional, Zechlin, H., additional, Zhdanov, V.I., additional, and Živec, M., additional

Published
2021
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3. Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre

Author

Acharyya, A., primary, Adam, R., additional, Adams, C., additional, Agudo, I., additional, Aguirre-Santaella, A., additional, Alfaro, R., additional, Alfaro, J., additional, Alispach, C., additional, Aloisio, R., additional, Batista, R. Alves, additional, Amati, L., additional, Ambrosi, G., additional, Angüner, E.O., additional, Antonelli, L.A., additional, Aramo, C., additional, Araudo, A., additional, Armstrong, T., additional, Arqueros, F., additional, Asano, K., additional, Ascasíbar, Y., additional, Ashley, M., additional, Balazs, C., additional, Ballester, O., additional, Larriva, A. Baquero, additional, Martins, V. Barbosa, additional, Barkov, M., additional, de Almeida, U. Barres, additional, Barrio, J.A., additional, Bastieri, D., additional, Becerra, J., additional, Beck, G., additional, Tjus, J. Becker, additional, Benbow, W., additional, Benito, M., additional, Berge, D., additional, Bernardini, E., additional, Bernlöhr, K., additional, Berti, A., additional, Bertucci, B., additional, Beshley, V., additional, Biasuzzi, B., additional, Biland, A., additional, Bissaldi, E., additional, Biteau, J., additional, Blanch, O., additional, Blazek, J., additional, Bocchino, F., additional, Boisson, C., additional, Arbeletche, L. Bonneau, additional, Bordas, P., additional, Bosnjak, Z., additional, Bottacini, E., additional, Bozhilov, V., additional, Bregeon, J., additional, Brill, A., additional, Bringmann, T., additional, Brown, A.M., additional, Brun, P., additional, Brun, F., additional, Bruno, P., additional, Bulgarelli, A., additional, Burton, M., additional, Burtovoi, A., additional, Buscemi, M., additional, Cameron, R., additional, Capasso, M., additional, Caproni, A., additional, Capuzzo-Dolcetta, R., additional, Caraveo, P., additional, Carosi, R., additional, Carosi, A., additional, Casanova, S., additional, Cascone, E., additional, Cassol, F., additional, Catalani, F., additional, Cauz, D., additional, Cerruti, M., additional, Chadwick, P., additional, Chaty, S., additional, Chen, A., additional, Chernyakova, M., additional, Chiaro, G., additional, Chiavassa, A., additional, Chikawa, M., additional, Chudoba, J., additional, Çolak, M., additional, Conforti, V., additional, Coniglione, R., additional, Conte, F., additional, Contreras, J.L., additional, Coronado-Blazquez, J., additional, Costa, A., additional, Costantini, H., additional, Cotter, G., additional, Cristofari, P., additional, D'A𝚤, A., additional, D'Ammando, F., additional, Damone, L.A., additional, Daniel, M.K., additional, Dazzi, F., additional, Angelis, A. De, additional, Caprio, V. De, additional, Anjos, R. de Cássia dos, additional, Pino, E.M. de Gouveia Dal, additional, Lotto, B. De, additional, Martino, D. De, additional, Wilhelmi, E. de Oña, additional, Palma, F. De, additional, de Souza, V., additional, Delgado, C., additional, Giler, A.G. Delgado, additional, Volpe, D. della, additional, Depaoli, D., additional, Girolamo, T. Di, additional, Pierro, F. Di, additional, Venere, L. Di, additional, Diebold, S., additional, Dmytriiev, A., additional, Domínguez, A., additional, Donini, A., additional, Doro, M., additional, Ebr, J., additional, Eckner, C., additional, Edwards, T. D. P., additional, Ekoume, T.R.N., additional, Elsässer, D., additional, Evoli, C., additional, Falceta-Goncalves, D., additional, Fedorova, E., additional, Fegan, S., additional, Feng, Q., additional, Ferrand, G., additional, Ferrara, G., additional, Fiandrini, E., additional, Fiasson, A., additional, Filipovic, M., additional, Fioretti, V., additional, Fiori, M., additional, Foffano, L., additional, Fontaine, G., additional, Fornieri, O., additional, Franco, F.J., additional, Fukami, S., additional, Fukui, Y., additional, Gaggero, D., additional, Galaz, G., additional, Gammaldi, V., additional, Garcia, E., additional, Garczarczyk, M., additional, Gascon, D., additional, Gent, A., additional, Ghalumyan, A., additional, Gianotti, F., additional, Giarrusso, M., additional, Giavitto, G., additional, Giglietto, N., additional, Giordano, F., additional, Giuliani, A., additional, Glicenstein, J., additional, Gnatyk, R., additional, Goldoni, P., additional, González, M.M., additional, Gourgouliatos, K., additional, Granot, J., additional, Grasso, D., additional, Green, J., additional, Grillo, A., additional, Gueta, O., additional, Gunji, S., additional, Halim, A., additional, Hassan, T., additional, Heller, M., additional, Cadena, S. Hernández, additional, Hiroshima, N., additional, Hnatyk, B., additional, Hofmann, W., additional, Holder, J., additional, Horan, D., additional, Hörandel, J., additional, Horvath, P., additional, Hovatta, T., additional, Hrabovsky, M., additional, Hrupec, D., additional, Hughes, G., additional, Humensky, T.B., additional, Hütten, M., additional, Iarlori, M., additional, Inada, T., additional, Inoue, S., additional, Iocco, F., additional, Iori, M., additional, Jamrozy, M., additional, Janecek, P., additional, Jin, W., additional, Jouvin, L., additional, Jurysek, J., additional, Karukes, E., additional, Katarzyński, K., additional, Kazanas, D., additional, Kerszberg, D., additional, Kherlakian, M.C., additional, Kissmann, R., additional, Knödlseder, J., additional, Kobayashi, Y., additional, Kohri, K., additional, Komin, N., additional, Kubo, H., additional, Kushida, J., additional, Lamanna, G., additional, Lapington, J., additional, Laporte, P., additional, de Oliveira, M.A. Leigui, additional, Lenain, J., additional, Leone, F., additional, Leto, G., additional, Lindfors, E., additional, Lohse, T., additional, Lombardi, S., additional, Longo, F., additional, Lopez, A., additional, López, M., additional, López-Coto, R., additional, Loporchio, S., additional, Luque-Escamilla, P.L., additional, Mach, E., additional, Maggio, C., additional, Maier, G., additional, Mallamaci, M., additional, de Almeida, R. Malta Nunes, additional, Mandat, D., additional, Manganaro, M., additional, Mangano, S., additional, Manicò, G., additional, Marculewicz, M., additional, Mariotti, M., additional, Markoff, S., additional, Marquez, P., additional, Martí, J., additional, Martinez, O., additional, Martínez, M., additional, Martínez, G., additional, Martínez-Huerta, H., additional, Maurin, G., additional, Mazin, D., additional, Mbarubucyeye, J.D., additional, Miranda, D. Medina, additional, Meyer, M., additional, Miceli, M., additional, Miener, T., additional, Minev, M., additional, Miranda, J.M., additional, Mirzoyan, R., additional, Mizuno, T., additional, Mode, B., additional, Moderski, R., additional, Mohrmann, L., additional, Molina, E., additional, Montaruli, T., additional, Moralejo, A., additional, Morcuende-Parrilla, D., additional, Morselli, A., additional, Mukherjee, R., additional, Mundell, C., additional, Nagai, A., additional, Nakamori, T., additional, Nemmen, R., additional, Niemiec, J., additional, Nieto, D., additional, Nikołajuk, M., additional, Ninci, D., additional, Noda, K., additional, Nosek, D., additional, Nozaki, S., additional, Ohira, Y., additional, Ohishi, M., additional, Ohtani, Y., additional, Oka, T., additional, Okumura, A., additional, Ong, R.A., additional, Orienti, M., additional, Orito, R., additional, Orlandini, M., additional, Orlando, S., additional, Orlando, E., additional, Ostrowski, M., additional, Oya, I., additional, Pagano, I., additional, Pagliaro, A., additional, Palatiello, M., additional, Pantaleo, F.R., additional, Paredes, J.M., additional, Pareschi, G., additional, Parmiggiani, N., additional, Patricelli, B., additional, Pavletić, L., additional, Pe'er, A., additional, Pecimotika, M., additional, Pérez-Romero, J., additional, Persic, M., additional, Petruk, O., additional, Pfrang, K., additional, Piano, G., additional, Piatteli, P., additional, Pietropaolo, E., additional, Pillera, R., additional, Pilszyk, B., additional, Pintore, F., additional, Pohl, M., additional, Poireau, V., additional, Prado, R.R., additional, Prandini, E., additional, Prast, J., additional, Principe, G., additional, Prokoph, H., additional, Prouza, M., additional, Przybilski, H., additional, Pühlhofer, G., additional, Pumo, M.L., additional, Queiroz, F., additional, Quirrenbach, A., additional, Rainò, S., additional, Rando, R., additional, Razzaque, S., additional, Recchia, S., additional, Reimer, O., additional, Reisenegger, A., additional, Renier, Y., additional, Rhode, W., additional, Ribeiro, D., additional, Ribó, M., additional, Richtler, T., additional, Rico, J., additional, Rieger, F., additional, Rinchiuso, L., additional, Rizi, V., additional, Rodriguez, J., additional, Fernandez, G. Rodriguez, additional, Ramirez, J.C. Rodriguez, additional, Rojas, G., additional, Romano, P., additional, Romeo, G., additional, Rosado, J., additional, Rowell, G., additional, Rudak, B., additional, Russo, F., additional, Sadeh, I., additional, Sæther Hatlen, E., additional, Safi-Harb, S., additional, Greus, F. Salesa, additional, Salina, G., additional, Sanchez, D., additional, Sánchez-Conde, M., additional, Sangiorgi, P., additional, Sano, H., additional, Santander, M., additional, Santos, E.M., additional, Santos-Lima, R., additional, Sanuy, A., additional, Sarkar, S., additional, Saturni, F.G., additional, Sawangwit, U., additional, Schussler, F., additional, Schwanke, U., additional, Sciacca, E., additional, Scuderi, S., additional, Seglar-Arroyo, M., additional, Sergijenko, O., additional, Servillat, M., additional, Seweryn, K., additional, Shalchi, A., additional, Sharma, P., additional, Shellard, R.C., additional, Siejkowski, H., additional, Silk, J., additional, Siqueira, C., additional, Sliusar, V., additional, Słowikowska, A., additional, Sokolenko, A., additional, Sol, H., additional, Spencer, S., additional, Stamerra, A., additional, Stanič, S., additional, Starling, R., additional, Stolarczyk, T., additional, Straumann, U., additional, Strišković, J., additional, Suda, Y., additional, Suomijarvi, T., additional, Świerk, P., additional, Tavecchio, F., additional, Taylor, L., additional, Tejedor, L.A., additional, Teshima, M., additional, Testa, V., additional, Tibaldo, L., additional, Peixoto, C.J. Todero, additional, Tokanai, F., additional, Tonev, D., additional, Tosti, G., additional, Tosti, L., additional, Tothill, N., additional, Truzzi, S., additional, Travnicek, P., additional, Vagelli, V., additional, Vallage, B., additional, Vallania, P., additional, Eldik, C. van, additional, Vandenbroucke, J., additional, Varner, G.S., additional, Vassiliev, V., additional, Acosta, M. Vázquez, additional, Vecchi, M., additional, Ventura, S., additional, Vercellone, S., additional, Vergani, S., additional, Verna, G., additional, Viana, A., additional, Vigorito, C.F., additional, Vink, J., additional, Vitale, V., additional, Vorobiov, S., additional, Vovk, I., additional, Vuillaume, T., additional, Wagner, S.J., additional, Walter, R., additional, Watson, J., additional, Weniger, C., additional, White, R., additional, White, M., additional, Wiemann, R., additional, Wierzcholska, A., additional, Will, M., additional, Williams, D.A., additional, Wischnewski, R., additional, Yanagita, S., additional, Yang, L., additional, Yoshikoshi, T., additional, Zacharias, M., additional, Zaharijas, G., additional, Zakaria, A.A., additional, Zampieri, L., additional, Zanin, R., additional, Zaric, D., additional, Zavrtanik, M., additional, Zavrtanik, D., additional, Zdziarski, A.A., additional, Zech, A., additional, Zechlin, H., additional, Zhdanov, V.I., additional, and Živec, M., additional

Published
2021
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4. AGILE Observations of Fast Radio Bursts.

Author

Verrecchia, F., Casentini, C., Tavani, M., Ursi, A., Mereghetti, S., Pilia, M., Cardillo, M., Addis, A., Barbiellini, G., Baroncelli, L., Bulgarelli, A., Cattaneo, P. W., Chen, A., Costa, E., Del Monte, E., Piano, A. Di, Ferrari, A., Fioretti, V., Longo, F., and Lucarelli, F.

Subjects
HARD X-rays, SOLAR flares, COINCIDENCE, DETECTORS
Abstract

We report on a systematic search for hard X-ray and γ-ray emission in coincidence with fast radio bursts (FRBs) observed by the AGILE satellite. We used 13 yr of AGILE archival data searching for time coincidences between exposed FRBs and events detectable by the MCAL (0.4–100 MeV) and GRID (50 MeV–30 GeV) detectors at timescales ranging from milliseconds to days/weeks. The current AGILE sky coverage allowed us to extend the search for high-energy emission preceding and following the FRB occurrence. We considered all FRB sources currently included in catalogs and identified a subsample (15 events) for which a good AGILE exposure with either MCAL or GRID was obtained. In this paper we focus on nonrepeating FRBs, compared to a few nearby repeating sources. We did not detect significant MeV or GeV emission from any event. Our hard X-ray upper limits (ULs) in the MeV energy range were obtained for timescales from submillisecond to seconds, and in the GeV range from minutes to weeks around event times. We focus on a subset of five nonrepeating and two repeating FRB sources whose distances are most likely smaller than that of 180916.J0158+65 (150 Mpc). For these sources, our MeV ULs translate into ULs on the isotropically emitted energy of about 3 × 1046 erg, comparable to that observed in the 2004 giant flare from the Galactic magnetar SGR 1806–20. On average, these nearby FRBs emit radio pulses of energies significantly larger than the recently detected SGR 1935+2154 and are not yet associated with intense MeV flaring. [ABSTRACT FROM AUTHOR]

Published
2021
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5. A Deep Learning Method for AGILE-GRID Gamma-Ray Burst Detection.

Author

Parmiggiani, N., Bulgarelli, A., Fioretti, V., Piano, A. Di, Giuliani, A., Longo, F., Verrecchia, F., Tavani, M., Beneventano, D., and Macaluso, A.

Subjects
GAMMA ray bursts, GRAVITATIONAL wave detectors, DEEP learning, CONVOLUTIONAL neural networks, BIG data, IMAGE converters
Abstract

The follow-up of external science alerts received from gamma-ray burst (GRB) and gravitational wave detectors is one of the AGILE Team's current major activities. The AGILE team developed an automated real-time analysis pipeline to analyze AGILE Gamma-Ray Imaging Detector (GRID) data to detect possible counterparts in the energy range 0.1–10 GeV. This work presents a new approach for detecting GRBs using a convolutional neural network (CNN) to classify the AGILE-GRID intensity maps by improving the GRB detection capability over the Li & Ma method, currently used by the AGILE team. The CNN is trained with large simulated data sets of intensity maps. The AGILE complex observing pattern due to the so-called "spinning mode" is studied to prepare data sets to test and evaluate the CNN. A GRB emission model is defined from the second Fermi-LAT GRB catalog and convoluted with the AGILE observing pattern. Different p-value distributions are calculated, evaluating, using the CNN, millions of background-only maps simulated by varying the background level. The CNN is then used on real data to analyze the AGILE-GRID data archive, searching for GRB detections using the trigger time and position taken from the Swift-BAT, Fermi-GBM, and Fermi-LAT GRB catalogs. From these catalogs, the CNN detects 21 GRBs with a significance of ≥3σ, while the Li & Ma method detects only two GRBs. The results shown in this work demonstrate that the CNN is more effective in detecting GRBs than the Li & Ma method in this context and can be implemented into the AGILE-GRID real-time analysis pipeline. [ABSTRACT FROM AUTHOR]

Published
2021
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6. AGILESim: Monte Carlo Simulation of the AGILE Gamma-Ray Telescope.

Author

Fioretti, V., Bulgarelli, A., Tavani, M., Sabatini, S., Aboudan, A., Argan, A., Cattaneo, P. W., Chen, A. W., Donnarumma, I., Longo, F., Galli, M., Giuliani, A., Marisaldi, M., Parmiggiani, N., and Rappoldi, A.

Subjects
*KALMAN filtering, *MONTE Carlo method, *ELECTRONIC instruments, *IMAGE converters, *ENERGY bands, *GAMMA ray spectrometry
Abstract

The accuracy of Monte Carlo simulations in reproducing the scientific performance of space telescopes (e.g., angular resolution) is mandatory for a correct design of the mission. A brand-new Monte Carlo simulator of the Astrorivelatore Gamma ad Immagini LEggero (AGILE)/Gamma-Ray Imaging Detector (GRID) space telescope, AGILESim, is built using the customizable Bologna Geant4 Multi-Mission Simulator (BoGEMMS) architecture and the latest Geant4 library to reproduce the instrument performance of the AGILE/GRID instrument. The Monte Carlo simulation output is digitized in the BoGEMMS postprocessing pipeline, according to the instrument electronic readout logic, then converted into the onboard data handling format, and finally analyzed by the standard mission on-ground reconstruction pipeline, including the Kalman filter, as a real observation in space. In this paper we focus on the scientific validation of AGILESim, performed by reproducing (i) the conversion efficiency of the tracker planes, (ii) the tracker charge readout distribution measured by the on-ground assembly, integration, and verification activity, and (iii) the point-spread function of in-flight observations of the Vela pulsar in the 100 MeV–1 GeV energy range. We measure an in-flight angular resolution (full width at half-maximum) for Vela-like point sources of and in the 100–300 and 300–1000 MeV energy bands, respectively. The successful cross-comparison of the simulation results with the AGILE on-ground and in-space performance validates the BoGEMMS framework for its application to future gamma-ray trackers (e.g., e-ASTROGAM and AMEGO). [ABSTRACT FROM AUTHOR]

Published
2020
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7. THE AGILE ALERT SYSTEM FOR GAMMA-RAY TRANSIENTS.

Author

Bulgarelli, A., Trifoglio, M., Gianotti, F., Tavani, M., Parmiggiani, N., Fioretti, V., Chen, A. W., Vercellone, S., Pittori, C., Verrecchia, F., Lucarelli, F., Santolamazza, P., Fanari, G., Giommi, P., Beneventano, D., Argan, A., Trois, A., Scalise, E., Longo, F., and Pellizzoni, A.

Subjects
GAMMA ray detectors, ARTIFICIAL satellites, ALGORITHMS, MATHEMATICAL optimization, ASTROPHYSICS
Abstract

In recent years, a new generation of space missions has offered great opportunities for discovery in high-energy astrophysics. In this article we focus on the scientific operations of the Gamma-Ray Imaging Detector (GRID) on board the AGILE space mission. AGILE-GRID, sensitive in the energy range of 30 MeV-30 GeV, has detected many γ-ray transients of both galactic and extragalactic origin. This work presents the AGILE innovative approach to fast γ-ray transient detection, which is a challenging task and a crucial part of the AGILE scientific program. The goals are to describe (1) the AGILE Gamma-Ray Alert System, (2) a new algorithm for blind search identification of transients within a short processing time, (3) the AGILE procedure for γ-ray transient alert management, and (4) the likelihood of ratio tests that are necessary to evaluate the post-trial statistical significance of the results. Special algorithms and an optimized sequence of tasks are necessary to reach our goal. Data are automatically analyzed at every orbital downlink by an alert pipeline operating on different timescales. As proper flux thresholds are exceeded, alerts are automatically generated and sent as SMS messages to cellular telephones, via e-mail, and via push notifications from an application for smartphones and tablets. These alerts are crosschecked with the results of two pipelines, and a manual analysis is performed. Being a small scientific-class mission, AGILE is characterized by optimization of both scientific analysis and ground-segment resources. The system is capable of generating alerts within two to three hours of a data downlink, an unprecedented reaction time in γ-ray astrophysics. [ABSTRACT FROM AUTHOR]

Published
2014
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