Science, Vol.343, No.6166, 42-47, 2014
Fermi-LAT Observations of the Gamma-Ray Burst GRB 130427A
Ackermann M ,
Ajello M ,
Asano K ,
Atwood WB ,
Axelsson M ,
Baldini L ,
Ballet J ,
Barbiellini G ,
Baring MG ,
Bastieri D ,
Bechtol K ,
Bellazzini R ,
Bissaldi E ,
Bonamente E ,
Bregeon J ,
Brigida M ,
Bruel P ,
Buehler R ,
Burgess JM ,
Buson S ,
Caliandro GA ,
Cameron RA ,
Caraveo PA ,
Cecchi C ,
Chaplin V ,
Charles E ,
Chekhtman A ,
Cheung CC ,
Chiang J ,
Chiaro G ,
Ciprini S ,
Claus R ,
Cleveland W ,
Cohen-Tanugi J ,
Collazzi A ,
Cominsky LR ,
Connaughton V ,
Conrad J ,
Cutini S ,
D'Ammando F ,
de Angelis A ,
DeKlotz M ,
de Palma F ,
Dermer CD ,
Desiante R ,
Diekmann A ,
Di Venere L ,
Drell PS ,
Drlica-Wagner A ,
Favuzzi C ,
Fegan SJ ,
Ferrara EC ,
Finke J ,
Fitzpatrick G ,
Focke WB ,
Franckowiak A ,
Fukazawa Y ,
Funk S ,
Fusco P ,
Gargano F ,
Gehrels N ,
Germani S ,
Gibby M ,
Giglietto N ,
Giles M ,
Giordano F ,
Giroletti M ,
Godfrey G ,
Granot J ,
Grenier IA ,
Grove JE ,
Gruber D ,
Guiriec S ,
Hadasch D ,
Hanabata Y ,
Harding AK ,
Hayashida M ,
Hays E ,
Horan D ,
Hughes RE ,
Inoue Y ,
Jogler T ,
Johannesson G ,
Johnson WN ,
Kawano T ,
Knodlseder J ,
Kocevski D ,
Kuss M ,
Lande J ,
Larsson S ,
Latronico L ,
Longo F ,
Loparco F ,
Lovellette MN ,
Lubrano P ,
Mayer M ,
Mazziotta MN ,
McEnery JE ,
Michelson PF ,
Mizuno T ,
Moiseev AA ,
Monzani ME ,
Moretti E ,
Morselli A ,
Moskalenko IV ,
Murgia S ,
Nemmen R ,
Nuss E ,
Ohno M ,
Ohsugi T ,
Okumura A ,
Omodei N ,
Orienti M ,
Paneque D ,
Pelassa V ,
Perkins JS ,
Pesce-Rollins M ,
Petrosian V ,
Piron F ,
Pivato G ,
Porter TA ,
Racusin JL ,
Raino S ,
Rando R ,
Razzano M ,
Razzaque S ,
Reimer A ,
Reimer O ,
Ritz S ,
Roth M ,
Ryde F ,
Sartori A ,
Parkinson PMS ,
Scargle JD ,
Schulz A ,
Sgro C ,
Siskind EJ ,
Sonbas E ,
Spandre G ,
Spinelli P ,
Tajima H ,
Takahashi H ,
Thayer JG ,
Thayer JB ,
Thompson DJ ,
Tibaldo L ,
Tinivella M ,
Torres DF ,
Tosti G ,
Troja E ,
Usher TL ,
Vandenbroucke J ,
Vasileiou V ,
Vianello G ,
Vitale V ,
Winer BL ,
Wood KS ,
Yamazaki R ,
Younes G ,
Yu HF ,
Zhu SJ ,
Bhat PN ,
Briggs MS ,
Byrne D ,
Foley S ,
Goldstein A ,
Jenke P ,
Kippen RM ,
Kouveliotou C ,
McBreen S ,
Meegan C ,
Paciesas WS ,
Preece R ,
Rau A ,
Tierney D ,
van der Horst AJ ,
von Kienlin A ,
Wilson-Hodge C ,
Xiong S ,
Cusumano G ,
La Parola V ,
Cummings JR
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 gamma-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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