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American Association for the Advancement of Science, Science, 6166(343), p. 42-47

DOI: 10.1126/science.1242353

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Fermi-LAT Observations of the Gamma-Ray Burst GRB 130427A

Journal article published in 2013 by M. Ackermann, M. Ajello ORCID, K. Asano, W.~B B. Atwood, M. Axelsson, L. Baldini ORCID, J. Ballet, G. Barbiellini, M.~G G. Baring, D. Bastieri ORCID, K. Bechtol, R. Bellazzini, E. Bissaldi ORCID, E. Bonamente, J. Bregeon and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Data provided by SHERPA/RoMEO

Abstract

The observations of the exceptionally bright gamma-ray burst (GRB) 130427A by the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope provide constraints on the nature of these unique astrophysical sources. GRB 130427A had the largest fluence, highest-energy photon (95 GeV), longest γ-ray duration (20 hours), and one of the largest isotropic energy releases ever observed from a GRB. Temporal and spectral analyses of GRB 130427A challenge the widely accepted model that the nonthermal high-energy emission in the afterglow phase of GRBs is synchrotron emission radiated by electrons accelerated at an external shock.

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