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

Abdo, A A; Ackermann, M; Ajello, M; Bechtol, K; Berenji, B; Blandford, R D; Bloom, E D; Borgland, A W; Asano, K; Atwood, W B; Axelsson, M; Baldini, L; Bellazzini, R; Ballet, J; Barbiellini, G; Baring, M G; Bastieri, D; Bhat, P N; Bissaldi, E; Bonamente, E

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

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

Journal Article · Fri Nov 20 00:00:00 EST 2009 · Astrophysical Journal (Online)

DOI:https://doi.org/10.1088/0004-637X/706/1/L138· OSTI ID:21378171

Abdo, A A ^[1]; Ackermann, M; Ajello, M; Bechtol, K; Berenji, B; Blandford, R D; Bloom, E D; Borgland, A W ^[2]; Asano, K ^[3]; Atwood, W B ^[4]; Axelsson, M ^[5]; Baldini, L; Bellazzini, R ^[6]; Ballet, J ^[7]; Barbiellini, G ^[8]; Baring, M G ^[9]; Bastieri, D ^[10]; Bhat, P N ^[11]; Bissaldi, E ^[12]; Bonamente, E ^[13]

Space Science Division, Naval Research Laboratory, Washington, DC 20375 (United States)
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 (United States)
Department of Physics, Tokyo Institute of Technology, Meguro City, Tokyo 152-8551 (Japan)
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 (United States)
Department of Astronomy, Stockholm University, SE-106 91 Stockholm (Sweden)
Istituto Nazionale di fisica Nucleare, Sezione di Pisa, I-56127 Pisa (Italy)
Laboratoire AIM, CEA-IRFU/CNRS/Universite Paris Diderot, Service d'Astrophysique, CEA Saclay, 91191 Gif sur Yvette (France)
Istituto Nazionale di fisica Nucleare, Sezione di Trieste, I-34127 Trieste (Italy)
Rice University, Department of Physics and Astronomy, MS-108, P.O. Box 1892, Houston, TX 77251 (United States)
Istituto Nazionale di fisica Nucleare, Sezione di Padova, I-35131 Padova (Italy)
University of Alabama in Huntsville, Huntsville, AL 35899 (United States)
Max-Planck Institut fuer extraterrestrische Physik, 85748 Garching (Germany)
Istituto Nazionale di fisica Nucleare, Sezione di Perugia, I-06123 Perugia (Italy)

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 approx50 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 {sup -1.5}. The LAT detected a photon with the highest energy so far measured from a GRB, 33.4{sup +2.7}{sub -3.5} GeV. This event arrived 82 s after the GBM trigger and approx50 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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OSTI ID:: 21378171

Journal Information:: Astrophysical Journal (Online), Vol. 706, Issue 1; Other Information: DOI: 10.1088/0004-637X/706/1/L138; ISSN 1538-4357

Country of Publication:: United States

Language:: English

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Jet propagations, breakouts and photospheric emissions in collapsing massive progenitors of long duration gamma ray bursts Nagakura, Hiroki; Ito, Hirotaka; Kiuchi, Kenta arXiv https://doi.org/10.48550/arxiv.1009.2326	text	January 2010
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A theory of photospheric emission from relativistic, collimated outflows Lundman, Christoffer; Pe'er, Asaf; Ryde, Felix arXiv https://doi.org/10.48550/arxiv.1208.2965	text	January 2012
Neutrino Decays over Cosmological Distances and the Implications for Neutrino Telescopes Baerwald, Philipp; Bustamante, Mauricio; Winter, Walter arXiv https://doi.org/10.48550/arxiv.1208.4600	text	January 2012
Evidence for a Photospheric Component in the Prompt Emission of the Short GRB120323A and its Effects on the GRB Hardness-Luminosity Relation Guiriec, S.; Daigne, F.; Hascoët, R. arXiv https://doi.org/10.48550/arxiv.1210.7252	text	January 2012
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On the magnetization of gamma-ray burst blast waves Lemoine, Martin; Li, Zhuo; Wang, Xiang-Yu arXiv https://doi.org/10.48550/arxiv.1305.3689	text	January 2013
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Gamma-Ray Burst Spectrum with Decaying Magnetic Field Zhao, X. H.; Li, Z.; Liu, X. W. arXiv https://doi.org/10.48550/arxiv.1310.0551	text	January 2013
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Physics of Gamma-Ray Bursts Prompt Emission Pe'er, Asaf arXiv https://doi.org/10.48550/arxiv.1504.02626	text	January 2015
The Fermi GBM gamma-ray burst time-resolved spectral catalog: brightest bursts in the first four years Yu, Hoi-Fung; Preece, Robert D.; Greiner, Jochen arXiv https://doi.org/10.48550/arxiv.1601.05206	text	January 2016
Search for Gamma Ray Bursts with the ARGO-YBJ Detector in Shower Mode Bartoli, B.; Bernardini, P.; Bi, X. J. arXiv https://doi.org/10.48550/arxiv.1703.09284	text	January 2017
Electrons' energy in GRB afterglows implied by radio peaks Beniamini, Paz; van der Horst, Alexander J. arXiv https://doi.org/10.48550/arxiv.1706.07817	text	January 2017
Low-energy Spectra of Gamma-ray Bursts from Cooling Electrons Geng, Jin-Jun; Huang, Yong-Feng; Wu, Xue-Feng arXiv https://doi.org/10.48550/arxiv.1709.05899	text	January 2017
Modeling the high-energy emission in GRB 110721A and implications on the early multiwavelength and polarimetric observations Fraija, N.; Lee, W. H.; Araya, M. arXiv https://doi.org/10.48550/arxiv.1709.06263	text	January 2017
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Multi-color blackbody emission in GRB 081221 Hou, Shu-Jin; Zhang, Bin-Bin; Meng, Yan-Zhi arXiv https://doi.org/10.48550/arxiv.1808.03942	text	January 2018
Inverse Compton Scattering Spectra of Gamma-Ray Burst Prompt Emission Zhang, Yue; Geng, Jin-Jun; Huang, Yong-Feng arXiv https://doi.org/10.48550/arxiv.1901.05268	text	January 2019
A Search for Cosmic Neutrino and Gamma-Ray Emitting Transients in 7.3 Years of ANTARES and Fermi LAT Data Solares, H. A. Ayala; Cowen, D. F.; DeLaunay, J. J. arXiv https://doi.org/10.48550/arxiv.1904.06420	text	January 2019
The physical conditions of the afterglow implied by MAGIC's sub-TeV observations of GRB 190114C Derishev, Evgeny; Piran, Tsvi arXiv https://doi.org/10.48550/arxiv.1905.08285	text	January 2019
Modeling the observations of GRB 180720B: From radio to sub-TeV gamma-rays Fraija, N.; Dichiara, S.; Pedreira, A. C. Caligula do E. S. arXiv https://doi.org/10.48550/arxiv.1905.13572	text	January 2019
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow Ajello, M.; Arimoto, M.; Axelsson, M. arXiv https://doi.org/10.48550/arxiv.1909.10605	text	January 2019

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79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COSMIC GAMMA BURSTS
EMISSION
GEV RANGE
KEV RANGE
MEV RANGE 10-100
PHOTONS
RED SHIFT
TELESCOPES
TIME RESOLUTION
BOSONS
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IONIZING RADIATIONS
MASSLESS PARTICLES
MEV RANGE
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Title: FERMI OBSERVATIONS OF GRB 090902B: A DISTINCT SPECTRAL COMPONENT IN THE PROMPT AND DELAYED EMISSION

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