Fermi Observations of GRB 090902B: A Distinct Spectral Component in the Prompt and Delayed Emission

doi:10.1088/0004-637X/706/1/L138

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A. A. Abdo et al 2009 ApJ 706 L138 doi:10.1088/0004-637X/706/1/L138

FERMI OBSERVATIONS OF GRB 090902B: A DISTINCT SPECTRAL COMPONENT IN THE PROMPT AND DELAYED EMISSION

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A. A. Abdo^1,2, M. Ackermann³, M. Ajello³, K. Asano^4,5, W. B. Atwood⁶, M. Axelsson^7,8, L. Baldini⁹, J. Ballet¹⁰, G. Barbiellini^11,12, M. G. Baring¹³, D. Bastieri^14,15, K. Bechtol³, R. Bellazzini⁹, B. Berenji³, P. N. Bhat¹⁶, E. Bissaldi¹⁷, R. D. Blandford³, E. D. Bloom³, E. Bonamente^18,19, A. W. Borgland³, A. Bouvier³, J. Bregeon⁹, A. Brez⁹, M. S. Briggs¹⁶, M. Brigida^20,21, P. Bruel²², J. M. Burgess¹⁶, D. N. Burrows²³, S. Buson¹⁵, G. A. Caliandro^20,21, R. A. Cameron³, P. A. Caraveo²⁴, J. M. Casandjian¹⁰, C. Cecchi^18,19, Ö. Çelik^25,26,27, A. Chekhtman^1,28, C. C. Cheung^1,2,25, J. Chiang³, S. Ciprini^18,19, R. Claus³, J. Cohen-Tanugi²⁹, L. R. Cominsky³⁰, V. Connaughton¹⁶, J. Conrad^8,31,63, S. Cutini³², V. d'Elia³², C. D. Dermer¹, A. de Angelis³³, F. de Palma^20,21, S. W. Digel³, B. L. Dingus³⁴, E. do Couto e Silva³, P. S. Drell³, R. Dubois³, D. Dumora^35,36, C. Farnier²⁹, C. Favuzzi^20,21, S. J. Fegan²², J. Finke^1,2, G. Fishman³⁷, W. B. Focke³, P. Fortin²², M. Frailis³³, Y. Fukazawa³⁸, S. Funk³, P. Fusco^20,21, F. Gargano²¹, N. Gehrels^23,25,39, S. Germani^18,19, G. Giavitto⁴⁰, B. Giebels²², N. Giglietto^20,21, F. Giordano^20,21, T. Glanzman³, G. Godfrey³, A. Goldstein¹⁶, J. Granot⁴¹, J. Greiner¹⁷, I. A. Grenier¹⁰, J. E. Grove¹, L. Guillemot⁴², S. Guiriec¹⁶, Y. Hanabata³⁸, A. K. Harding²⁵, M. Hayashida³, E. Hays²⁵, D. Horan²², R. E. Hughes⁴³, M. S. Jackson^8,31,44, G. Jóhannesson³, A. S. Johnson³, R. P. Johnson⁶, W. N. Johnson¹, T. Kamae³, H. Katagiri³⁸, J. Kataoka^4,45, N. Kawai^4,46, M. Kerr⁴⁷, R. M. Kippen³⁴, J. Knödlseder⁴⁸, D. Kocevski³, N. Komin^10,29, C. Kouveliotou³⁷, M. Kuss⁹, J. Lande³, L. Latronico⁹, M. Lemoine-Goumard^35,36, F. Longo^11,12, F. Loparco^20,21, B. Lott^35,36, M. N. Lovellette¹, P. Lubrano^18,19, G. M. Madejski³, A. Makeev^1,28, M. N. Mazziotta²¹, S. McBreen^17,49, J. E. McEnery^25,39, S. McGlynn^8,44, C. Meegan⁵⁰, P. Mészáros²³, C. Meurer^8,31, P. F. Michelson³, W. Mitthumsiri³, T. Mizuno³⁸, A. A. Moiseev^26,39, C. Monte^20,21, M. E. Monzani³, E. Moretti^11,12,40, A. Morselli⁵¹, I. V. Moskalenko³, S. Murgia³, T. Nakamori⁴, P. L. Nolan³, J. P. Norris⁵², E. Nuss²⁹, M. Ohno⁵³, T. Ohsugi³⁸, N. Omodei⁹, E. Orlando¹⁷, J. F. Ormes⁵², W. S. Paciesas¹⁶, D. Paneque³, J. H. Panetta³, V. Pelassa²⁹, M. Pepe^18,19, M. Pesce-Rollins⁹, V. Petrosian³, F. Piron²⁹, T. A. Porter⁶, R. Preece¹⁶, S. Rainò^20,21, R. Rando^14,15, A. Rau¹⁷, M. Razzano⁹, S. Razzaque^1,2, A. Reimer^3,54, O. Reimer^3,54, T. Reposeur^35,36, S. Ritz⁶, L. S. Rochester³, A. Y. Rodriguez⁵⁵, P. W. A. Roming²³, M. Roth⁴⁷, F. Ryde^8,44, H. F.-W. Sadrozinski⁶, D. Sanchez²², A. Sander⁴³, P. M. Saz Parkinson⁶, J. D. Scargle⁵⁶, T. L. Schalk⁶, C. Sgrò⁹, E. J. Siskind⁵⁷, P. D. Smith⁴³, P. Spinelli^20,21, M. Stamatikos^25,43, F. W. Stecker²⁵, G. Stratta³², M. S. Strickman¹, D. J. Suson⁵⁸, C. A. Swenson²³, H. Tajima³, H. Takahashi³⁸, T. Tanaka³, J. B. Thayer³, J. G. Thayer³, D. J. Thompson²⁵, L. Tibaldo^10,14,15, D. F. Torres^55,59, G. Tosti^18,19, A. Tramacere^3,60, Y. Uchiyama^3,53, T. Uehara³⁸, T. L. Usher³, A. J. van der Horst^37,64, V. Vasileiou^25,26,27, N. Vilchez⁴⁸, V. Vitale^51,61, A. von Kienlin¹⁷, A. P. Waite³, P. Wang³, C. Wilson-Hodge³⁷, B. L. Winer⁴³, K. S. Wood¹, R. Yamazaki³⁸, T. Ylinen^8,44,62 and M. Ziegler⁶

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¹ Space Science Division, Naval Research Laboratory, Washington, DC 20375, USA
² National Research Council Research Associate, National Academy of Sciences, Washington, DC 20001, USA
³ 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
⁴ Department of Physics, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551, Japan
⁵ Interactive Research Center of Science, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551, Japan
⁶ 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
⁷ Department of Astronomy, Stockholm University, SE-106 91 Stockholm, Sweden
⁸ The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, Sweden
⁹ Istituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, Italy
¹⁰ Laboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette, France
¹¹ Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, Italy
¹² Dipartimento di Fisica, Università di Trieste, I-34127 Trieste, Italy
¹³ Rice University, Department of Physics and Astronomy, MS-108, P.O. Box 1892, Houston, TX 77251, USA
¹⁴ Istituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy
¹⁵ Dipartimento di Fisica "G. Galilei," Università di Padova, I-35131 Padova, Italy
¹⁶ University of Alabama in Huntsville, Huntsville, AL 35899, USA
¹⁷ Max-Planck Institut für extraterrestrische Physik, 85748 Garching, Germany
¹⁸ Istituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, Italy
¹⁹ Dipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, Italy
²⁰ Dipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, Italy
²¹ Istituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, Italy
²² Laboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, France
²³ Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
²⁴ INAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, I-20133 Milano, Italy
²⁵ NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
²⁶ Center for Research and Exploration in Space Science and Technology (CRESST), NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
²⁷ University of Maryland, Baltimore County, Baltimore, MD 21250, USA
²⁸ George Mason University, Fairfax, VA 22030, USA
²⁹ Laboratoire de Physique Théorique et Astroparticules, Université Montpellier 2, CNRS/IN2P3, Montpellier, France
³⁰ Department of Physics and Astronomy, Sonoma State University, Rohnert Park, CA 94928-3609, USA
³¹ Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, Sweden
³² Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), Italy
³³ Dipartimento di Fisica, Università di Udine and Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Gruppo Collegato di Udine, I-33100 Udine, Italy
³⁴ Los Alamos National Laboratory, Los Alamos, NM 87545, USA
³⁵ Université de Bordeaux, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France
³⁶ CNRS/IN2P3, Centre d'Études Nucléaires Bordeaux Gradignan, UMR 5797, Gradignan, 33175, France
³⁷ NASA Marshall Space Flight Center, Huntsville, AL 35812, USA
³⁸ Department of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, Japan
³⁹ University of Maryland, College Park, MD 20742, USA
⁴⁰ Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, and Università di Trieste, I-34127 Trieste, Italy
⁴¹ Centre for Astrophysics Research, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
⁴² Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
⁴³ Department of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USA
⁴⁴ Department of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, Sweden
⁴⁵ Waseda University, 1-104 Totsukamachi, Shinjuku-ku, Tokyo, 169-8050, Japan
⁴⁶ Cosmic Radiation Laboratory, Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan
⁴⁷ Department of Physics, University of Washington, Seattle, WA 98195-1560, USA
⁴⁸ Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, BP 44346, F-30128 Toulouse Cedex 4, France
⁴⁹ University College Dublin, Belfield, Dublin 4, Republic of Ireland
⁵⁰ Universities Space Research Association (USRA), Columbia, MD 21044, USA
⁵¹ Istituto Nazionale di Fisica Nucleare, Sezione di Roma "Tor Vergata," I-00133 Roma, Italy
⁵² Department of Physics and Astronomy, University of Denver, Denver, CO 80208, USA
⁵³ Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
⁵⁴ Institut für Astro- und Teilchenphysik and Institut für Theoretische Physik, Leopold-Franzens-Universität Innsbruck, A-6020 Innsbruck, Austria
⁵⁵ Institut de Ciencies de l'Espai (IEEC-CSIC), Campus UAB, 08193 Barcelona, Spain
⁵⁶ Space Sciences Division, NASA Ames Research Center, Moffett Field, CA 94035-1000, USA
⁵⁷ NYCB Real-Time Computing Inc., Lattingtown, NY 11560-1025, USA
⁵⁸ Department of Chemistry and Physics, Purdue University Calumet, Hammond, IN 46323-2094, USA
⁵⁹ Institució Catalana de Recerca i Estudis Avançats (ICREA), Barcelona, Spain
⁶⁰ Consorzio Interuniversitario per la Fisica Spaziale (CIFS), I-10133 Torino, Italy
⁶¹ Dipartimento di Fisica, Università di Roma "Tor Vergata," I-00133 Roma, Italy
⁶² School of Pure and Applied Natural Sciences, University of Kalmar, SE-391 82 Kalmar, Sweden
⁶³ Royal Swedish Academy of Sciences Research Fellow, funded by a grant from the K. A. Wallenberg Foundation.
⁶⁴ NASA Postdoctoral Program Fellow, NSSTC, 320 Sparkman Drive, Huntsville, AL 35805, USA.

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