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. 2014 Jan 3;343(6166):42-7.
doi: 10.1126/science.1242353. Epub 2013 Nov 21.

Fermi-LAT observations of the gamma-ray burst GRB 130427A

M Ackermann  1 , M Ajello, K Asano, W B Atwood, M Axelsson, L Baldini, J Ballet, G Barbiellini, M G Baring, D Bastieri, K Bechtol, R Bellazzini, E Bissaldi, E Bonamente, J Bregeon, M Brigida, P Bruel, R Buehler, J Michael Burgess, S Buson, G A Caliandro, R A Cameron, P A Caraveo, C Cecchi, V Chaplin, E Charles, A Chekhtman, C C Cheung, J Chiang, G Chiaro, S Ciprini, R Claus, W Cleveland, J Cohen-Tanugi, A Collazzi, L R Cominsky, V Connaughton, J Conrad, S Cutini, F D'Ammando, A de Angelis, M DeKlotz, F de Palma, C D Dermer, R Desiante, A Diekmann, L Di Venere, P S Drell, A Drlica-Wagner, C Favuzzi, S J Fegan, E C Ferrara, J Finke, G Fitzpatrick, W B Focke, A Franckowiak, Y Fukazawa, S Funk, P Fusco, F Gargano, N Gehrels, S Germani, M Gibby, N Giglietto, M Giles, F Giordano, M Giroletti, G Godfrey, J Granot, I A Grenier, J E Grove, D Gruber, S Guiriec, D Hadasch, Y Hanabata, A K Harding, M Hayashida, E Hays, D Horan, R E Hughes, Y Inoue, T Jogler, G Jóhannesson, W N Johnson, T Kawano, J Knödlseder, D Kocevski, M Kuss, J Lande, S Larsson, L Latronico, F Longo, F Loparco, M N Lovellette, P Lubrano, M Mayer, M N Mazziotta, J E McEnery, P F Michelson, T Mizuno, A A Moiseev, M E Monzani, E Moretti, A Morselli, I V Moskalenko, S Murgia, R Nemmen, E Nuss, M Ohno, T Ohsugi, A Okumura, N Omodei, M Orienti, D Paneque, V Pelassa, J S Perkins, M Pesce-Rollins, V Petrosian, F Piron, G Pivato, T A Porter, J L Racusin, S Rainò, R Rando, M Razzano, S Razzaque, A Reimer, O Reimer, S Ritz, M Roth, F Ryde, A Sartori, P M Saz Parkinson, J D Scargle, A Schulz, C Sgrò, E J Siskind, E Sonbas, G Spandre, P Spinelli, H Tajima, H Takahashi, J G Thayer, J B Thayer, D J Thompson, L Tibaldo, M Tinivella, D F Torres, G Tosti, E Troja, T L Usher, J Vandenbroucke, V Vasileiou, G Vianello, V Vitale, B L Winer, K S Wood, R Yamazaki, G Younes, H-F Yu, S J Zhu, P N Bhat, M S Briggs, D Byrne, S Foley, A Goldstein, P Jenke, R M Kippen, C Kouveliotou, S McBreen, C Meegan, W S Paciesas, R Preece, A Rau, D Tierney, A J van der Horst, A von Kienlin, C Wilson-Hodge, S Xiong, G Cusumano, V La Parola, J R Cummings
Affiliations

Fermi-LAT observations of the gamma-ray burst GRB 130427A

M Ackermann et al. Science. .

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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