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MAGIC Observations of the Nearby Short Gamma-Ray Burst GRB 160821B *

2021; IOP Publishing; Volume: 908; Issue: 1 Linguagem: Inglês

10.3847/1538-4357/abd249

1538-4357

V. A. Acciari, Stefano Ansoldi, L. A. Antonelli, A. Arbet Engels, Katsuaki Asano, Dominik Baack, A. Babić, Andrés Baquero, U. Barres de Almeida, J. A. Barrio, J. Becerra González, W. Bednarek, Lorenzo Bellizzi, E. Bernardini, M. Bernardos, A. Berti, Jürgen Besenrieder, W. Bhattacharyya, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, G. Busetto, R. Carosi, Giovanni Ceribella, M. Cerruti, Yating Chai, A. Chilingarian, S. Cikota, S. M. Colak, E. Colombo, J. L. Contreras, J. Cortina, S. Covino, Giacomo D’Amico, V. D’Elia, P. Da Vela, F. Dazzi, A. De Angelis, B. De Lotto, M. Delfino, J. Delgado, C. Delgado Mendez, Davide Depaoli, F. Di Pierro, L. Di Venere, E. Do Souto Espiñeira, D. Dominis Prester, Alice Donini, D. Dorner, M. Doro, D. Elsäesser, V. Fallah Ramazanı, Alicia Fattorini, G. Ferrara, Luca Foffano, M. V. Fonseca, L. Font, C. Fruck, Satoshi Fukami, R. J. Garcı́a López, M. Garczarczyk, Sargis Gasparyan, M. Gaug, N. Giglietto, F. Giordano, Paweł Gliwny, N. Godinović, Jarred Gershon Green, D. Green, D. Hadasch, A. Hahn, Lea Heckmann, J. Herrera, John Hoang, Dario Hrupec, Moritz Hütten, Tomohiro Inada, Susumu Inoue, Kazuma Ishio, Y. Iwamura, Jenni Jormanainen, L. Jouvin, Y. Kajiwara, Marie Karjalainen, D. Kerszberg, Yukiho Kobayashi, H. Kubo, J. Kushida, A. Lamastra, A. La Barbera, F. Leone, E. Lindfors, S. Lombardi, F. Longo, R. López-Coto, Marcos López, A. López-Oramas, S. Loporchio, B. Machado de Oliveira Fraga, C. Maggio, P. Majumdar, M. Makariev, M. Mallamaci, G. Maneva, M. Manganaro, K. Mannheim, L. Maraschi, M. Mariotti, M. Martı́nez, D. Mazin, S. Mender, S. Mičanović, Davide Miceli, Tjark Miener, M. Minev, J. M. Miranda, R. Mirzoyan, E. Molina, A. Moralejo, Daniel Morcuende, V. Moreno, E. Moretti, V. Neustroev, Cosimo Nigro, K. Nilsson, D. Ninci, K. Nishijima, K. Noda, S. Nozaki, Yoshiki Ohtani, Tomohiko Oka, Jorge Otero-Santos, S. Paiano, M. Palatiello, D. Paneque, R. Paoletti, J. M. Paredes, Lovro Pavletić, Pablo Peñil, C. Perennes, M. Persic, P. G. Prada Moroni, E. Prandini, Chaitanya Priyadarshi, Ivica Puljak, W. Rhode, M. Ribó, J. Rico, Chiara Righi, A. Rugliancich, L. Saha, N. Sahakyan, T. Saito, S. Sakurai, K. Satalecka, Francesco Gabriele Saturni, Bernd Schleicher, K. Schmidt, T. Schweizer, J. Sitarek, I. Šnidarić, D. Sobczyńska, Alessia Spolon, A. Stamerra, D. Strom, M. Strzys, Y. Suda, T. Surić, Mitsunari Takahashi, F. Tavecchio, P. Temnikov, T. Terzić, M. Teshima, N. Torres-Albà, Luca Tosti, Stefano Truzzi, Antonio Tutone, Juliane van Scherpenberg, G. Vanzo, M. Vázquez Acosta, Sofia Ventura, V. Verguilov, C. Vigorito, V. Vitale, Ievgen Vovk, Martin Will, Darko Zarić, Lara Nava,

Astrophysics and Cosmic Phenomena

The coincident detection of GW170817 in gravitational waves and electromagnetic radiation spanning the radio to MeV gamma-ray bands provided the first direct evidence that short gamma-ray bursts (GRBs) can originate from binary neutron star (BNS) mergers. On the other hand, the properties of short GRBs in high-energy gamma rays are still poorly constrained, with only $\sim$20 events detected in the GeV band, and none in the TeV band. GRB~160821B is one of the nearest short GRBs known at $z=0.162$. Recent analyses of the multiwavelength observational data of its afterglow emission revealed an optical-infrared kilonova component, characteristic of heavy-element nucleosynthesis in a BNS merger. Aiming to better clarify the nature of short GRBs, this burst was automatically followed up with the MAGIC telescopes, starting from 24 seconds after the burst trigger. Evidence of a gamma-ray signal is found above $\sim$0.5 TeV at a significance of $\sim3\,\sigma$ during observations that lasted until 4 hours after the burst. Assuming that the observed excess events correspond to gamma-ray emission from GRB 160821B, in conjunction with data at other wavelengths, we investigate its origin in the framework of GRB afterglow models. The simplest interpretation with one-zone models of synchrotron-self-Compton emission from the external forward shock has difficulty accounting for the putative TeV flux. Alternative scenarios are discussed where the TeV emission can be relatively enhanced. The role of future GeV-TeV observations of short GRBs in advancing our understanding of BNS mergers and related topics is briefly addressed.