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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 AjelloK AsanoW B AtwoodM AxelssonL BaldiniJ BalletG BarbielliniM G BaringD BastieriK BechtolR BellazziniE BissaldiE BonamenteJ BregeonM BrigidaP BruelR BuehlerJ Michael BurgessS BusonG A CaliandroR A CameronP A CaraveoC CecchiV ChaplinE CharlesA ChekhtmanC C CheungJ ChiangG ChiaroS CipriniR ClausW ClevelandJ Cohen-TanugiA CollazziL R CominskyV ConnaughtonJ ConradS CutiniF D'AmmandoA de AngelisM DeKlotzF de PalmaC D DermerR DesianteA DiekmannL Di VenereP S DrellA Drlica-WagnerC FavuzziS J FeganE C FerraraJ FinkeG FitzpatrickW B FockeA FranckowiakY FukazawaS FunkP FuscoF GarganoN GehrelsS GermaniM GibbyN GigliettoM GilesF GiordanoM GirolettiG GodfreyJ GranotI A GrenierJ E GroveD GruberS GuiriecD HadaschY HanabataA K HardingM HayashidaE HaysD HoranR E HughesY InoueT JoglerG JóhannessonW N JohnsonT KawanoJ KnödlsederD KocevskiM KussJ LandeS LarssonL LatronicoF LongoF LoparcoM N LovelletteP LubranoM MayerM N MazziottaJ E McEneryP F MichelsonT MizunoA A MoiseevM E MonzaniE MorettiA MorselliI V MoskalenkoS MurgiaR NemmenE NussM OhnoT OhsugiA OkumuraN OmodeiM OrientiD PanequeV PelassaJ S PerkinsM Pesce-RollinsV PetrosianF PironG PivatoT A PorterJ L RacusinS RainòR RandoM RazzanoS RazzaqueA ReimerO ReimerS RitzM RothF RydeA SartoriP M Saz ParkinsonJ D ScargleA SchulzC SgròE J SiskindE SonbasG SpandreP SpinelliH TajimaH TakahashiJ G ThayerJ B ThayerD J ThompsonL TibaldoM TinivellaD F TorresG TostiE TrojaT L UsherJ VandenbrouckeV VasileiouG VianelloV VitaleB L WinerK S WoodR YamazakiG YounesH-F YuS J ZhuP N BhatM S BriggsD ByrneS FoleyA GoldsteinP JenkeR M KippenC KouveliotouS McBreenC MeeganW S PaciesasR PreeceA RauD TierneyA J van der HorstA von KienlinC Wilson-HodgeS XiongG CusumanoV La ParolaJ R Cummings
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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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