Fermi-LAT Observations of the Gamma-Ray Burst GRB 130427A
M. AckermannDeutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, GermanyM. AjelloSpace Sciences Laboratory, University of California, Berkeley, CA 94720, USAKatsuaki AsanoInstitute for Cosmic Ray Research, University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa City, Chiba 277-8582, JapanW. B. AtwoodSanta Cruz Institute for Particle Physics, Department of Physics, and Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USAM. AxelssonDepartment of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, SwedenL. BaldiniIstituto Nazionale di Fisica Nucleare, Sezione di PisaJ. BalletAstrophysique, Instrumentation et ModélisationG. BarbielliniDipartimento di Fisica, Università di Trieste, I-34127 Trieste, ItalyMatthew G. BaringDepartment of Physics and Astronomy, Rice University, Houston, TX 77251, USAD. BastieriDipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, I-35131 Padova, ItalyK. BechtolKavli Institute for Particle Astrophysics and CosmologyR. BellazziniIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyC. MeeganIstituto Nazionale di Fisica Nucleare, Sezione di Trieste, and Università di Trieste, I-34127 Trieste, ItalyE. BonamenteIstituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, ItalyJ. BregeonIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyM. BrigidaIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyP. BruelÉcole PolytechniqueR. BuehlerDeutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, GermanyJ. Michael BurgessCenter for Space Plasma and Aeronomic Research, University of Alabama, Huntsville, AL 35899, USAS. BusonIstituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, ItalyG. A. CaliandroInstitut de Ciències de l’Espai (IEEE-CSIC), Campus UAB, 08193 Barcelona, SpainR. A. CameronStanford UniversityP. A. CaraveoINAF–Istituto di Astrofisica Spaziale e Fisica Cosmica, I-20133 Milano, ItalyC. CecchiIstituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, ItalyV. ChaplinCenter for Space Plasma and Aeronomic Research, University of Alabama, Huntsville, AL 35899, USAE. CharlesKavli Institute for Particle Astrophysics and CosmologyA. ChekhtmanCenter for Earth Observing and Space Research, College of Science, George Mason University, Fairfax, VA 22030, USA; resident at Naval Research Laboratory, Washington, DC 20375, USAC. C. CheungSpace Science Division, Naval Research Laboratory, Washington, DC 20375, USAJ. ChiangStanford UniversityG. ChiaroDipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, I-35131 Padova, ItalyS. CipriniIstituto Nazionale di Astrofisica–Osservatorio Astronomico di Roma, I-00040 Monte Porzio Catone (Roma), ItalyR. ClausW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAW. H. ClevelandUniversities Space Research Association, Columbia, MD 21044, USAJ. Cohen-TanugiInstitut National de Physique Nucléaire et de Physique des ParticulesA. C. CollazziNASA Postdoctoral Program Fellow, USAL. R. CominskyDepartment of Physics and Astronomy, Sonoma State University, Rohnert Park, CA 94928, USAV. ConnaughtonCenter for Space Plasma and Aeronomic Research, University of Alabama, Huntsville, AL 35899, USAJ. M. ConradRoyal Swedish Academy of Sciences Research Fellow, funded by a grant from the K. A. Wallenberg FoundationS. CutiniAgenzia Spaziale Italiana Science Data Center, I-00044 Frascati (Roma), ItalyF. D’AmmandoINAF Istituto di Radioastronomia, 40129 Bologna, ItalyA. De AngelisDipartimento di Fisica, Università di Udine, and Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Gruppo Collegato di Udine, I-33100 Udine, ItalyM. DeKlotzStellar Solutions Inc., 250 Cambridge Avenue, Suite 204, Palo Alto, CA 94306, USAF. de PalmaIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyC. D. DermerSpace Science Division, Naval Research Laboratory, Washington, DC 20375, USAR. DesianteIstituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, ItalyA. DiekmannJacobs Technology, Huntsville, AL 35806, USAL. Di VenereKavli Institute for Particle Astrophysics and CosmologyP. S. DrellStanford UniversityA. Drlica-WagnerStanford UniversityC. FavuzziDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyS. FeganLaboratoire Leprince-Ringuet, École Polytechnique, CNRS/IN2P3, Palaiseau, FranceE. C. FerraraNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAJustin D. FinkeSpace Science Division, Naval Research Laboratory, Washington, DC 20375, USAG. FitzpatrickUniversity College Dublin, Belfield, Dublin 4, IrelandW. B. FockeStanford UniversityA. FranckowiakStanford UniversityY. FukazawaDepartment of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanS. FunkW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAP. FuscoIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyF. GarganoIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyN. GehrelsNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAS. GermaniIstituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, ItalyM. H. GibbyJacobs Technology, Huntsville, AL 35806, USAN. GigliettoDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyM. GilesJacobs Technology, Huntsville, AL 35806, USAF. GiordanoDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyM. GirolettiINAF Istituto di Radioastronomia, 40129 Bologna, ItalyG. GodfreyStanford UniversityJonathan GranotDepartment of Natural Sciences, Open University of Israel, Ra’anana 43537, IsraelI. A. GrenierAstrophysique, Instrumentation et ModélisationJ. E. GroveSpace Science Division, Naval Research Laboratory, Washington, DC 20375, USAD. GruberMax-Planck-Institut für Extraterrestrische Physik, 85748 Garching, GermanyS. GuiriecNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAD. HadaschInstitut de Ciències de l’Espai (IEEE-CSIC), Campus UAB, 08193 Barcelona, SpainY. HanabataDepartment of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanA. K. HardingNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAM. HayashidaStanford UniversityE. HaysNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAD. HoranLaboratoire Leprince-RinguetR. E. HughesDepartment of Physics, Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210, USAYoshiyuki InoueW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAT. JoglerKavli Institute for Particle Astrophysics and CosmologyG. JóhannessonScience Institute, University of Iceland, IS-107 Reykjavik, IcelandW. N. JohnsonSpace Science Division, Naval Research Laboratory, Washington, DC 20375, USAT. KawanoDepartment of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanJ. KnödlsederCentre National de la Recherche Scientifique, Paris, FranceD. KocevskiStanford UniversityM. KussIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyJ. LandéStanford UniversityS. LarssonDepartment of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, SwedenL. LatronicoIstituto Nazionale di Fisica Nucleare, Sezione di Torino, I-10125 Torino, ItalyF. LongoDipartimento di Fisica, Università di Trieste, I-34127 Trieste, ItalyF. LoparcoIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyM. N. LovelletteSpace Science Division, Naval Research Laboratory, Washington, DC 20375, USAP. LubranoDipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, ItalyM. MayerDeutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, GermanyM. N. MazziottaIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyJ. E. McEneryNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAP. F. MichelsonStanford UniversityTsunefumi MizunoHiroshima Astrophysical Science Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
2013en
ABI
Annotatsiya
Bright Lights Gamma-ray bursts (GRBs), bright flashes of gamma-ray light, are thought to be associated with the collapse of massive stars. GRB 130427A was detected on 27 April 2013, and it had the longest gamma-ray duration and one of the largest isotropic energy releases observed to date (see the Perspective by Fynbo ). Ackermann et al. (p. 42 , published online 21 November) report data obtained with the Fermi Gamma-Ray Space Telescope, which reveal a high-energy spectral component that cannot be accounted for by the standard external shock synchrotron radiation model. Vestrand et al. (p. 38 , published online 21 November) report the detection of an extremely bright flash of visible light and unexpected similarities between the variations of optical light and the highest-energy gamma rays that indicate a common origin. A detailed analysis of the first pulse of GRB 130427A by Preece et al. (p. 51 , published online 21 November) suggests that existing models cannot explain all the observed spectral and temporal behaviors simultaneously. Maselli et al. (p. 48 , published online 21 November) present x-ray and optical light curves of the burst's prompt emission as well as of its afterglow as recorded by the Swift satellite and a range of ground-based telescopes.
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