主要内容:
是第一个高能偏离Band谱的暴。
精彩摘抄:
光变
谱
拟合的谱，有一个多的成分
文章信息:
- · arXiv e-print (arXiv:1005.2141)
- · References in the Article
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| 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 |
| Authors: |
| Fermi LAT, The; GBM Collaborations |
| Publication: |
| eprint arXiv:1005.2141 |
| Publication Date: |
| 05/2010 |
| Origin: |
| ARXIV |
| Keywords: |
| Astrophysics - High Energy Astrophysical Phenomena |
| Comment: |
| 33 pages, 7 figures, Accepted for publication in ApJ. Contact Authors: James Chiang (jchiang@slac.stanford.edu), Jonathon Granot (j.granot@herts.ac.uk), Sylvain Guiriec (sylvain.guiriec@lpta.in2p3.fr), Masanori Ohno (ohno@astro.isas.jaxa.jp) |
| Bibliographic Code: |
| 2010arXiv1005.2141F |
Abstract
We present detailed observations of the bright short-hard gamma-ray burst GRB 090510 made with the Gamma-ray 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 $\Epeak = 3.9\pm 0.3$\,MeV, which is the highest yet measured, and a hard power-law component with photon index $-1.62\pm 0.03$ that dominates the emission below $\approx$\,20\,keV and above $\approx$\,100\,MeV. The onset of the high-energy spectral component appears to be delayed by $\sim$\,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 $30.5^{+5.8}_{-2.6}$ GeV, the highest ever measured from a short GRB. Observation of this photon sets a minimum bulk outflow Lorentz factor, $\Gamma\ga$\,1200, using simple $\gamma\gamma$ opacity arguments for this GRB at redshift $z = 0.903$ and a variability time scale on the order of tens of ms for the $\approx$\,100\,keV--few MeV flux. Stricter high confidence estimates imply $\Gamma \ga 1000$ 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 (SSC), external-shock synchrotron, and hadronic models are considered.
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