MAGIC detection of GRB 201216C at<i>z</i> = 1.1
Hidetarô Abe, S. Abe, V. A. Acciari, I. Agudo, T. Aniello, Stefano Ansoldi, L. A. Antonelli, A. Arbet Engels, Cornelia Arcaro, Manuel Artero, Katsuaki Asano, Dominik Baack, A. Babić, Andrés Baquero, U. Barres de Almeida, J. A. Barrio, Ivana Batković, J. Baxter, J. Becerra González, W. Bednarek, E. Bernardini, J. Bernete, A. Berti, Jürgen Besenrieder, C. Bigongiari, A. Biland, O. Blanch, G. Bonnoli, Ž. Bošnjak, Irene Burelli, G. Busetto, A. Campoy-Ordaz, A. Carosi, R. Carosi, M. Carretero-Castrillo, A. J. Castro‐Tirado, G. Ceribella, Yating Chai, A. Cifuentes, S. Cikota, 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, Antonino Del Popolo, M. Delfino, J. Delgado, C. Delgado Mendez, Davide Depaoli, F. Di Pierro, L. Di Venere, D. Dominis Prester, Alice Donini, D. Dorner, M. Doro, D. Elsäesser, Gabriel Emery, Juan Escudero, L. Fariña, Alicia Fattorini, L. Foffano, L. Font, Satoshi Fukami, Y. Fukazawa, R. J. Garcı́a López, M. Garczarczyk, Sargis Gasparyan, M. Gaug, J. G. Giesbrecht Paiva, N. Giglietto, F. Giordano, Paweł Gliwny, N. Godinović, R. Grau, D Green, Jarred Gershon Green, D. Hadasch, A. Hahn, T. Hassan, Lea Heckmann, J. Herrera, Dario Hrupec, Moritz Hütten, Ryo Imazawa, Tomohiro Inada, Roman Iotov, Kazuma Ishio, Irene Jiménez Martínez, Jenni Jormanainen, D. Kerszberg, Gert Werner Kluge, Yukiyasu Kobayashi, Pouya M. Kouch, H. Kubo
Abstract
ABSTRACT Gamma-ray bursts (GRBs) are explosive transient events occurring at cosmological distances, releasing a large amount of energy as electromagnetic radiation over several energy bands. We report the detection of the long GRB 201216C by the MAGIC telescopes. The source is located at z = 1.1 and thus it is the farthest one detected at very high energies. The emission above 70 GeV of GRB 201216C is modelled together with multiwavelength data within a synchrotron and synchrotron self-Compton (SSC) scenario. We find that SSC can explain the broad-band data well from the optical to the very-high-energy band. For the late-time radio data, a different component is needed to account for the observed emission. Differently from previous GRBs detected in the very-high-energy range, the model for GRB 201216C strongly favours a wind-like medium. The model parameters have values similar to those found in past studies of the afterglows of GRBs detected up to GeV energies.