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Fermi Observations of GRB 090510: A Short-Hard Gamma-Ray Burst With an Additional, Hard Power-Law Component From 10 Kev To Gev Energies

Ackermann, M.; Asano, K.; Atwood, W. B.; Axelsson, Magnus LU ; Baldini, L.; Ballet, J.; Barbiellini, G.; Baring, M. G.; Bastieri, D. and Bechtol, K., et al. (2010) In Astrophysical Journal 716(2). p.1178-1190
Abstract
We present detailed observations of the bright short-hard gamma-ray burst GRB 090510 made with the Gammaray Burst Monitor (GBM) and Large Area Telescope (LAT) on board the Fermi observatory. GRB 090510 is the first burst detected by the LAT that shows strong evidence for a deviation from a Band spectral fitting function during the prompt emission phase. The time-integrated spectrum is fit by the sum of a Band function with E-peak = 3.9 +/- 0.3 MeV, which is the highest yet measured, and a hard power-law component with photon index -1.62 +/- 0.03 that dominates the emission below approximate to 20 keV and above approximate to 100 MeV. The onset of the high-energy spectral component appears to be delayed by similar to 0.1 s with respect to... (More)
We present detailed observations of the bright short-hard gamma-ray burst GRB 090510 made with the Gammaray Burst Monitor (GBM) and Large Area Telescope (LAT) on board the Fermi observatory. GRB 090510 is the first burst detected by the LAT that shows strong evidence for a deviation from a Band spectral fitting function during the prompt emission phase. The time-integrated spectrum is fit by the sum of a Band function with E-peak = 3.9 +/- 0.3 MeV, which is the highest yet measured, and a hard power-law component with photon index -1.62 +/- 0.03 that dominates the emission below approximate to 20 keV and above approximate to 100 MeV. The onset of the high-energy spectral component appears to be delayed by similar to 0.1 s with respect to the onset of a component well fit with a single Band function. A faint GBM pulse and a LAT photon are detected 0.5 s before the main pulse. During the prompt phase, the LAT detected a photon with energy 30.5(-2.6)(+5.8) GeV, the highest ever measured from a short GRB. Observation of this photon sets a minimum bulk outflow Lorentz factor, Gamma greater than or similar to 1200, using simple.. opacity arguments for this GRB at redshift z = 0.903 and a variability timescale on the order of tens of ms for the approximate to 100 keV-few MeV flux. Stricter high confidence estimates imply Gamma greater than or similar to 1000 and still require that the outflows powering short GRBs are at least as highly relativistic as those of long-duration GRBs. Implications of the temporal behavior and power-law shape of the additional component on synchrotron/synchrotron self-Compton, external-shock synchrotron, and hadronic models are considered. (Less)
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keywords
non-thermal, gamma-ray burst: individual (GRB 090510), radiation mechanisms:
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Astrophysical Journal
volume
716
issue
2
pages
1178 - 1190
publisher
University of Chicago Press
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  • wos:000278459000022
  • scopus:77953213402
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0004-637X
DOI
10.1088/0004-637X/716/2/1178
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English
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1bf316ea-a608-40cf-862c-a8b7c574e948 (old id 1632319)
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2010-07-22 12:58:47
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@article{1bf316ea-a608-40cf-862c-a8b7c574e948,
  abstract     = {We present detailed observations of the bright short-hard gamma-ray burst GRB 090510 made with the Gammaray Burst Monitor (GBM) and Large Area Telescope (LAT) on board the Fermi observatory. GRB 090510 is the first burst detected by the LAT that shows strong evidence for a deviation from a Band spectral fitting function during the prompt emission phase. The time-integrated spectrum is fit by the sum of a Band function with E-peak = 3.9 +/- 0.3 MeV, which is the highest yet measured, and a hard power-law component with photon index -1.62 +/- 0.03 that dominates the emission below approximate to 20 keV and above approximate to 100 MeV. The onset of the high-energy spectral component appears to be delayed by similar to 0.1 s with respect to the onset of a component well fit with a single Band function. A faint GBM pulse and a LAT photon are detected 0.5 s before the main pulse. During the prompt phase, the LAT detected a photon with energy 30.5(-2.6)(+5.8) GeV, the highest ever measured from a short GRB. Observation of this photon sets a minimum bulk outflow Lorentz factor, Gamma greater than or similar to 1200, using simple.. opacity arguments for this GRB at redshift z = 0.903 and a variability timescale on the order of tens of ms for the approximate to 100 keV-few MeV flux. Stricter high confidence estimates imply Gamma greater than or similar to 1000 and still require that the outflows powering short GRBs are at least as highly relativistic as those of long-duration GRBs. Implications of the temporal behavior and power-law shape of the additional component on synchrotron/synchrotron self-Compton, external-shock synchrotron, and hadronic models are considered.},
  author       = {Ackermann, M. and Asano, K. and Atwood, W. B. and Axelsson, Magnus and Baldini, L. and Ballet, J. and Barbiellini, G. and Baring, M. G. and Bastieri, D. and Bechtol, K. and Bellazzini, R. and Berenji, B. and Bhat, P. N. and Bissaldi, E. and Blandford, R. D. and Bloom, E. D. and Bonamente, E. and Borgland, A. W. and Bouvier, A. and Bregeon, J. and Brez, A. and Briggs, M. S. and Brigida, M. and Bruel, P. and Buson, S. and Caliandro, G. A. and Cameron, R. A. and Caraveo, P. A. and Carrigan, S. and Casandjian, J. M. and Cecchi, C. and Celik, Oe. and Charles, E. and Chiang, J. and Ciprini, S. and Claus, R. and Cohen-Tanugi, J. and Connaughton, V. and Conrad, J. and Dermer, C. D. and de Palma, F. and Dingus, B. L. and do Couto e Silva, E. and Drell, P. S. and Dubois, R. and Dumora, D. and Farnier, C. and Favuzzi, C. and Fegan, S. J. and Finke, J. and Focke, W. B. and Frailis, M. and Fukazawa, Y. and Fusco, P. and Gargano, F. and Gasparrini, D. and Gehrels, N. and Germani, S. and Giglietto, N. and Giordano, F. and Glanzman, T. and Godfrey, G. and Granot, J. and Grenier, I. A. and Grondin, M. -H. and Grove, J. E. and Guiriec, S. and Hadasch, D. and Harding, A. K. and Hays, E. and Horan, D. and Hughes, R. E. and Johannesson, G. and Johnson, W. N. and Kamae, T. and Katagiri, H. and Kataoka, J. and Kawai, N. and Kippen, R. M. and Knoedlseder, J. and Kocevski, D. and Kouveliotou, C. and Kuss, M. and Lande, J. and Latronico, L. and Lemoine-Goumard, M. and Garde, M. Llena and Longo, F. and Loparco, F. and Lott, B. and Lovellette, M. N. and Lubrano, P. and Makeev, A. and Mazziotta, M. N. and McEnery, J. E. and McGlynn, S. and Meegan, C. and Meszaros, P. and Michelson, P. F. and Mitthumsiri, W. and Mizuno, T. and Moiseev, A. A. and Monte, C. and Monzani, M. E. and Moretti, E. and Morselli, A. and Moskalenko, I. V. and Murgia, S. and Nakajima, H. and Nakamori, T. and Nolan, P. L. and Norris, J. P. and Nuss, E. and Ohno, M. and Ohsugi, T. and Omodei, N. and Orlando, E. and Ormes, J. F. and Ozaki, M. and Paciesas, W. S. and Paneque, D. and Panetta, J. H. and Parent, D. and Pelassa, V. and Pepe, M. and Pesce-Rollins, M. and Piron, F. and Preece, R. and Raino, S. and Rando, R. and Razzano, M. and Razzaque, S. and Reimer, A. and Ritz, S. and Rodriguez, A. Y. and Roth, M. and Ryde, F. and Sadrozinski, H. F. -W. and Sander, A. and Scargle, J. D. and Schalk, T. L. and Sgro, C. and Siskind, E. J. and Smith, P. D. and Spandre, G. and Spinelli, P. and Stamatikos, M. and Stecker, F. W. and Strickman, M. S. and Suson, D. J. and Tajima, H. and Takahashi, H. and Takahashi, T. and Tanaka, T. and Thayer, J. B. and Thayer, J. G. and Thompson, D. J. and Tibaldo, L. and Toma, K. and Torres, D. F. and Tosti, G. and Tramacere, A. and Uchiyama, Y. and Uehara, T. and Usher, T. L. and van der Horst, A. J. and Vasileiou, V. and Vilchez, N. and Vitale, V. and von Kienlin, A. and Waite, A. P. and Wang, P. and Wilson-Hodge, C. and Winer, B. L. and Wu, X. F. and Yamazaki, R. and Yang, Z. and Ylinen, T. and Ziegler, M.},
  issn         = {0004-637X},
  keyword      = {non-thermal,gamma-ray burst: individual (GRB 090510),radiation mechanisms:},
  language     = {eng},
  number       = {2},
  pages        = {1178--1190},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {Fermi Observations of GRB 090510: A Short-Hard Gamma-Ray Burst With an Additional, Hard Power-Law Component From 10 Kev To Gev Energies},
  url          = {http://dx.doi.org/10.1088/0004-637X/716/2/1178},
  volume       = {716},
  year         = {2010},
}