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      Revealing x-ray and gamma ray temporal and spectral similarities in the GRB 190829A afterglow

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          Abstract

          Gamma-ray bursts (GRBs), which are bright flashes of gamma rays from extragalactic sources followed by fading afterglow emission, are associated with stellar core collapse events. We report the detection of very-high-energy (VHE) gamma rays from the afterglow of GRB 190829A, between 4 and 56 hours after the trigger, using the High Energy Stereoscopic System (H.E.S.S.). The low luminosity and redshift of GRB 190829A reduce both internal and external absorption, allowing determination of its intrinsic energy spectrum. Between energies of 0.18 and 3.3 tera–electron volts, this spectrum is described by a power law with photon index of 2.07 ± 0.09, similar to the x-ray spectrum. The x-ray and VHE gamma-ray light curves also show similar decay profiles. These similar characteristics in the x-ray and gamma-ray bands challenge GRB afterglow emission scenarios.

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          Most cited references35

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          Fluid dynamics of relativistic blast waves

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            Extragalactic background light inferred from AEGIS galaxy-SED-type fractions

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              MODELING THE EXTRAGALACTIC BACKGROUND LIGHT FROM STARS AND DUST

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                Author and article information

                Contributors
                Journal
                Science
                Science
                American Association for the Advancement of Science (AAAS)
                0036-8075
                1095-9203
                June 03 2021
                June 04 2021
                June 03 2021
                June 04 2021
                : 372
                : 6546
                : 1081-1085
                Affiliations
                [1 ]University of Namibia, Department of Physics, Windhoek 10005, Namibia.
                [2 ]Dublin Institute for Advanced Studies, Dublin 2, Ireland.
                [3 ]Max-Planck-Institut für Kernphysik, D 69029 Heidelberg, Germany.
                [4 ]High Energy Astrophysics Laboratory, Russian-Armenian University (RAU), Yerevan 0051, Armenia.
                [5 ]Aix Marseille Université, Centre national de la recherche scientifique (CNRS)/Institut National de Physique Nucléaire et Physique des Particules (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Marseille, France.
                [6 ]Centre for Space Research, North-West University, Potchefstroom 2520, South Africa.
                [7 ]Laboratoire d’Annecy de Physique des Particules (LAPP), Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, 74000 Annecy, France.
                [8 ]University of Oxford, Department of Physics, Denys Wilkinson Building, Oxford OX1 3RH, UK.
                [9 ]Institute for Research on the Fundamental Laws of the Universe (IRFU), Commissariat à l’énergie atomique (CEA), Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
                [10 ]Instytut Fizyki Jądrowej Polskiej Akademii Nauk (PAN), 31-342 Kraków, Poland.
                [11 ]Deutsches Elektronen-Synchrotron (DESY), D-15738 Zeuthen, Germany.
                [12 ]Obserwatorium Astronomiczne, Uniwersytet Jagielloński, 30-244 Kraków, Poland.
                [13 ]Department of Physics and Electrical Engineering, Linnaeus University, 351 95 Växjö, Sweden.
                [14 ]Institut für Astronomie und Astrophysik, Universität Tübingen, D 72076 Tübingen, Germany.
                [15 ]Dipartimento Interateneo di Fisica, Politecnico di Bari, 70125 Bari, Italy.
                [16 ]Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70125 Bari, Italy.
                [17 ]Laboratoire Univers et Théories, Observatoire de Paris, Université PSL, CNRS, Université de Paris, 92190 Meudon, France.
                [18 ]Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), F-75252 Paris, France.
                [19 ]Gravitation and Astroparticle Physics at the University of Amsterdam (GRAPPA), Anton Pannekoek Institute for Astronomy, University of Amsterdam, 1098 XH Amsterdam, Netherlands.
                [20 ]Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, D 91058 Erlangen, Germany.
                [21 ]Astronomical Observatory, The University of Warsaw, 00-478 Warsaw, Poland.
                [22 ]School of Physics, University of the Witwatersrand, Braamfontein, Johannesburg 2050, South Africa.
                [23 ]Université de Paris, CNRS, Astroparticule et Cosmologie, F-75013 Paris, France.
                [24 ]Universität Hamburg, Institut für Experimentalphysik, D 22761 Hamburg, Germany.
                [25 ]School of Physics and Astronomy, The University of Leicester, Leicester LE1 7RH, UK.
                [26 ]Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, 00-716 Warsaw, Poland.
                [27 ]Institut für Physik und Astronomie, Universität Potsdam, D 14476 Potsdam, Germany.
                [28 ]School of Physical Sciences, University of Adelaide, Adelaide, SA 5005, Australia.
                [29 ]Laboratoire Leprince-Ringuet, CNRS, Institut Polytechnique de Paris, F-91128 Palaiseau, France.
                [30 ]Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, F-34095 Montpellier Cedex 5, France.
                [31 ]Université Bordeaux, CNRS/IN2P3, Centre d’Études Nucléaires de Bordeaux Gradignan, 33175 Gradignan, France.
                [32 ]Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck, A-6020 Innsbruck, Austria.
                [33 ]Landessternwarte, Universität Heidelberg, Königstuhl, D 69117 Heidelberg, Germany.
                [34 ]Institute of Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, 87-100 Torun, Poland.
                [35 ]Department of Physics, Rikkyo University, Toshima-ku, Tokyo 171-8501, Japan.
                [36 ]Institut für Physik, Humboldt-Universität zu Berlin, D 12489 Berlin, Germany.
                [37 ]Department of Physics, University of the Free State, Bloemfontein 9300, South Africa.
                [38 ]Department of Physics, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.
                [39 ]Yerevan Physics Institute, 375036 Yerevan, Armenia.
                [40 ]Kavli Institute for the Physics and Mathematics of the Universe (World Premier International Research Center Initiative (WPI)), The University of Tokyo Institutes for Advanced Study (UTIAS), The University of Tokyo, Kashiwa, Chiba, 277-8583, Japan.
                [41 ]School of Physics and Astronomy, Sun Yat Sen University, Guangzhou 510275, People’s Republic of China.
                Article
                10.1126/science.abe8560
                0b207c28-81ad-4cf4-8c98-77acd38ed427
                © 2021

                https://www.sciencemag.org/about/science-licenses-journal-article-reuse

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