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Title:
Fermi Observations of GRB 090902B: A Distinct Spectral Component in the Prompt and Delayed Emission
Authors:
Abdo, A. A.; Ackermann, M.; Ajello, M.; Asano, K.; Atwood, W. B.; Axelsson, M.; Baldini, L.; Ballet, J.; Barbiellini, G.; Baring, M. G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; Berenji, B.; Bhat, P. N.; Bissaldi, E.; Blandford, R. D.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Bouvier, A.; Bregeon, J.; Brez, A.; Briggs, M. S.; Brigida, M.; Bruel, P.; Burgess, J. M.; Burrows, D. N.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Casandjian, J. M.; Cecchi, C.; Çelik, Ö.; Chekhtman, A.; Cheung, C. C.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Cominsky, L. R.; Connaughton, V.; Conrad, J.; Cutini, S.; d'Elia, V.; Dermer, C. D.; de Angelis, A.; de Palma, F.; Digel, S. W.; Dingus, B. L.; Silva, E. do Couto e.; Drell, P. S.; Dubois, R.; Dumora, D.; Farnier, C.; Favuzzi, C.; Fegan, S. J.; Finke, J.; Fishman, G.; Focke, W. B.; Fortin, P.; Frailis, M.; Fukazawa, Y.; Funk, S.; Fusco, P.; Gargano, F.; Gehrels, N.; Germani, S.; Giavitto, G.; Giebels, B.; Giglietto, N.; Giordano, F.; Glanzman, T.; Godfrey, G.; Goldstein, A.; Granot, J.; Greiner, J.; Grenier, I. A.; Grove, J. E.; Guillemot, L.; Guiriec, S.; Hanabata, Y.; Harding, A. K.; Hayashida, M.; Hays, E.; Horan, D.; Hughes, R. E.; Jackson, M. S.; Jóhannesson, G.; Johnson, A. S.; Johnson, R. P.; Johnson, W. N.; Kamae, T.; Katagiri, H.; Kataoka, J.; Kawai, N.; Kerr, M.; Kippen, R. M.; Knödlseder, J.; Kocevski, D.; Komin, N.; Kouveliotou, C.; Kuss, M.; Lande, J.; Latronico, L.; Lemoine-Goumard, M.; Longo, F.; Loparco, F.; Lott, B.; Lovellette, M. N.; Lubrano, P.; Madejski, G. M.; Makeev, A.; Mazziotta, M. N.; McBreen, S.; McEnery, J. E.; McGlynn, S.; Meegan, C.; Mészáros, P.; Meurer, C.; Michelson, P. F.; Mitthumsiri, W.; Mizuno, T.; Moiseev, A. A.; Monte, C.; Monzani, M. E.; Moretti, E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Nakamori, T.; Nolan, P. L.; Norris, J. P.; Nuss, E.; Ohno, M.; Ohsugi, T.; Omodei, N.; Orlando, E.; Ormes, J. F.; Paciesas, W. S.; Paneque, D.; Panetta, J. H.; Pelassa, V.; Pepe, M.; Pesce-Rollins, M.; Petrosian, V.; Piron, F.; Porter, T. A.; Preece, R.; Rainò, S.; Rando, R.; Rau, A.; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Reposeur, T.; Ritz, S.; Rochester, L. S.; Rodriguez, A. Y.; Roming, P. W. A.; Roth, M.; Ryde, F.; Sadrozinski, H. F.-W.; Sanchez, D.; Sander, A.; Saz Parkinson, P. M.; Scargle, J. D.; Schalk, T. L.; Sgrò, C.; Siskind, E. J.; Smith, P. D.; Spinelli, P.; Stamatikos, M.; Stecker, F. W.; Stratta, G.; Strickman, M. S.; Suson, D. J.; Swenson, C. A.; Tajima, H.; Takahashi, H.; Tanaka, T.; Thayer, J. B.; Thayer, J. G.; Thompson, D. J.; Tibaldo, L.; Torres, D. F.; Tosti, G.; Tramacere, A.; Uchiyama, Y.; Uehara, T.; Usher, T. L.; van der Horst, A. J.; Vasileiou, V.; Vilchez, N.; Vitale, V.; von Kienlin, A.; Waite, A. P.; Wang, P.; Wilson-Hodge, C.; Winer, B. L.; Wood, K. S.; Yamazaki, R.; Ylinen, T.; Ziegler, M.
Affiliation:
AA(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; National Research Council Research Associate, National Academy of Sciences, Washington, DC 20001, USA ), AB(W. 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, USA ), AC(W. 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, USA ), AD(Department of Physics, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551, Japan ; Interactive Research Center of Science, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551, Japan ), AE(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), AF(Department of Astronomy, Stockholm University, SE-106 91 Stockholm, Sweden ; The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ), AG(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AH(Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France ), AI(Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy ; Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy ), AJ(Rice University, Department of Physics and Astronomy, MS-108, P.O. Box 1892, Houston, TX 77251, USA ), AK(Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy ; Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy ), AL(W. 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, USA ), AM(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AN(W. 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, USA ), AO(University of Alabama in Huntsville, Huntsville, AL 35899, USA ), AP(Max-Planck Institut für extraterrestrische Physik, 85748 Garching, Germany ), AQ(W. 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, USA ), AR(W. 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, USA ), AS(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), AT(W. 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, USA ), AU(W. 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, USA ), AV(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AW(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), AX(University of Alabama in Huntsville, Huntsville, AL 35899, USA ), AY(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), AZ(Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France ), BA(University of Alabama in Huntsville, Huntsville, AL 35899, USA ), BB(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA ), BC(Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy ), BD(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), BE(W. 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, USA ), BF(INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, I-20133 Milano, Italy ), BG(Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France ), BH(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), BI(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; University of Maryland, Baltimore County, Baltimore, MD 21250, USA ), BJ(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; George Mason University, Fairfax, VA 22030, USA ), BK(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; National Research Council Research Associate, National Academy of Sciences, Washington, DC 20001, USA ; NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), BL(W. 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Wallenberg Foundation. ), BS(Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy ), BT(Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy ), BU(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ), BV(Dipartimento di Fisica, Università di Udine and Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Gruppo Collegato di Udine, I-33100 Udine, Italy ), BW(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), BX(W. 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, USA ), BY(Los Alamos National Laboratory, Los Alamos, NM 87545, USA ), BZ(W. W. 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Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), CJ(Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France ), CK(Dipartimento di Fisica, Università di Udine and Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Gruppo Collegato di Udine, I-33100 Udine, Italy ), CL(Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan ), CM(W. 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, USA ), CN(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), CO(Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), CP(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA ; NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; University of Maryland, College Park, MD 20742, USA ), CQ(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), CR(Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, and Università di Trieste, I-34127 Trieste, Italy ), CS(Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France ), CT(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), CU(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), CV(W. 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, USA ), CW(W. W. 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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, USA ), DH(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), DI(Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France ), DJ(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), DK(The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ), DL(W. 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, USA ), DM(W. W. 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Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA ), EB(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), EC(Université de Bordeaux, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ; CNRS/IN2P3, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ), EE(Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy ; Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy ), EE(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), EF(Université de Bordeaux, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ; CNRS/IN2P3, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ), EG(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ), EH(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), EI(W. 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, USA ), EJ(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; George Mason University, Fairfax, VA 22030, USA ), EK(Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), EL(Max-Planck Institut für extraterrestrische Physik, 85748 Garching, Germany ; University College Dublin, Belfield, Dublin 4, Republic of Ireland ), EM(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; University of Maryland, College Park, MD 20742, USA ), EN(The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ), EO(Universities Space Research Association (USRA), Columbia, MD 21044, USA ), EP(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA ), EQ(The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden ), ER(W. 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, USA ), ES(W. 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, USA ), ET(Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan ), EU(Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; University of Maryland, College Park, MD 20742, USA ), EV(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), EW(W. 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, USA ), EX(Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy ; Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, and Università di Trieste, I-34127 Trieste, Italy ), EY(Istituto Nazionale di Fisica Nucleare, Sezione di Roma "Tor Vergata," I-00133 Roma, Italy ), EZ(W. 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, USA ), FA(W. 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, USA ), FB(Department of Physics, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551, Japan ), FC(W. 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, USA ), FD(Department of Physics and Astronomy, University of Denver, Denver, CO 80208, USA ), FE(Laboratoire de Physique Théorique et Astroparticules, Université Montpellier 2, CNRS/IN2P3, Montpellier, France ), FF(Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan ), FG(Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan ), FH(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), FI(Max-Planck Institut für extraterrestrische Physik, 85748 Garching, Germany ), FJ(Department of Physics and Astronomy, University of Denver, Denver, CO 80208, USA ), FK(University of Alabama in Huntsville, Huntsville, AL 35899, USA ), FL(W. 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, USA ), FM(W. 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, USA ), FN(Laboratoire de Physique Théorique et Astroparticules, Université Montpellier 2, CNRS/IN2P3, Montpellier, France ), FO(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), FP(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), FQ(W. 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, USA ), FR(Laboratoire de Physique Théorique et Astroparticules, Université Montpellier 2, CNRS/IN2P3, Montpellier, France ), FS(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), FT(University of Alabama in Huntsville, Huntsville, AL 35899, USA ), FU(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), FV(Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy ; Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy ), FW(Max-Planck Institut für extraterrestrische Physik, 85748 Garching, Germany ), FX(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), FY(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ; National Research Council Research Associate, National Academy of Sciences, Washington, DC 20001, USA ), FZ(W. 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, USA ; Institut für Astro- und Teilchenphysik and Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck, A-6020 Innsbruck, Austria ), GA(W. 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, USA ; Institut für Astro- und Teilchenphysik and Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck, A-6020 Innsbruck, Austria ), GB(Université de Bordeaux, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ; CNRS/IN2P3, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France ), GC(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), GD(W. 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, USA ), GE(Institut de Ciencies de l'Espai (IEEC-CSIC), Campus UAB, 08193 Barcelona, Spain ), GF(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA ), GG(Department of Physics, University of Washington, Seattle, WA 98195-1560, USA ), GH(The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ), GI(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), GJ(Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France ), GK(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), GL(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), GM(Space Sciences Division, NASA Ames Research Center, Moffett Field, CA 94035-1000, USA ), GN(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA ), GO(Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy ), GP(NYCB Real-Time Computing Inc., Lattingtown, NY 11560-1025, USA ), GQ(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), GR(Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy ; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy ), GS(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), GT(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), GU(Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy ), GV(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ), GW(Department of Chemistry and Physics, Purdue University Calumet, Hammond, IN 46323-2094, USA ), GX(Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA ), GY(W. 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, USA ), GZ(Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan ), HA(W. 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, USA ), HB(W. 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, USA ), HC(W. 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, USA ), HD(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ), HE(Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France ; Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy ; Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy ), HF(Institut de Ciencies de l'Espai (IEEC-CSIC), Campus UAB, 08193 Barcelona, Spain ; Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain ), HG(Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy ; Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy ), HH(W. 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, USA ; Consorzio Interuniversitario per la Fisica Spaziale (CIFS), I-10133 Torino, Italy ), HI(W. 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, USA ; Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan ), HJ(Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan ), HK(W. 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, USA ), HL(NASA Marshall Space Flight Center, Huntsville, AL 35812, USA ; NASA Postdoctoral Program Fellow, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805, USA.), HM(NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA ; University of Maryland, Baltimore County, Baltimore, MD 21250, USA ), HN(Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, BP 44346, F-30128 Toulouse Cedex 4, France ), HO(Istituto Nazionale di Fisica Nucleare, Sezione di Roma "Tor Vergata," I-00133 Roma, Italy ; Dipartimento di Fisica, Università di Roma "Tor Vergata," I-00133 Roma, Italy ), HP(Max-Planck Institut für extraterrestrische Physik, 85748 Garching, Germany ), HQ(W. 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, USA ), HR(W. 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, USA ), HS(NASA Marshall Space Flight Center, Huntsville, AL 35812, USA ), HT(Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA ), HU(Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA ), HV(Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan ), HW(The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden ; Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden ; School of Pure and Applied Natural Sciences, University of Kalmar, SE-391 82 Kalmar, Sweden ), HX(Santa Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA )
Publication:
The Astrophysical Journal Letters, Volume 706, Issue 1, pp. L138-L144 (2009). (ApJL Homepage)
Publication Date:
11/2009
Origin:
IOP
ApJ Keywords:
gamma rays: bursts
DOI:
10.1088/0004-637X/706/1/L138
Bibliographic Code:
2009ApJ...706L.138A

Abstract

We report on the observation of the bright, long gamma-ray burst (GRB), GRB 090902B, by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on-board the Fermi observatory. This was one of the brightest GRBs to have been observed by the LAT, which detected several hundred photons during the prompt phase. With a redshift of z = 1.822, this burst is among the most luminous detected by Fermi. Time-resolved spectral analysis reveals a significant power-law component in the LAT data that is distinct from the usual Band model emission that is seen in the sub-MeV energy range. This power-law component appears to extrapolate from the GeV range to the lowest energies and is more intense than the Band component, both below ~50 keV and above 100 MeV. The Band component undergoes substantial spectral evolution over the entire course of the burst, while the photon index of the power-law component remains constant for most of the prompt phase, then hardens significantly toward the end. After the prompt phase, power-law emission persists in the LAT data as late as 1 ks post-trigger, with its flux declining as t –1.5. The LAT detected a photon with the highest energy so far measured from a GRB, 33.4+2.7 –3.5 GeV. This event arrived 82 s after the GBM trigger and ~50 s after the prompt phase emission had ended in the GBM band. We discuss the implications of these results for models of GRB emission and for constraints on models of the extragalactic background light.
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