Giuliani, A. 2009 AGILE对GRB 090510的观测
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Abstract
Short gamma-ray bursts (GRBs), typically lasting less than 2 s, are a special class of GRBs of great interest. We report the detection by the AGILE satellite of the short GRB 090510 which shows two clearly distinct emission phases: a prompt phase lasting ~ 200 msec and a second phase lasting tens of seconds. The burst is relatively intense in the 0.3-10 MeV range showing a spectrum of the prompt phase characterized by a large peak/cutoff energy near 3 MeV. Following the prompt phase, gamma-ray photons above 30 MeV were detected showing a power-law time decay of the flux of the type t^-1.3. The broad-band spectrum of this "delayed gamma-ray emission phase" is remarkably different from that of the prompt phase. It extends from sub-MeV to hundreds of MeV energies with a photon index alpha ~ 1.5. We present the timing and spectral data of GRB 090510 and briefly discuss its remarkable properties within the current models of gamma-ray emission of short GRBs.Bibtex entry for this abstract Preferred format for this abstract (see Preferences)
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