Agile Detection of Delayed Gamma-Ray Emission from the Short Gamma-Ray Burst GRB 090510 - INSPIRE

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Agile Detection of Delayed Gamma-Ray Emission from the Short Gamma-Ray Burst GRB 090510

AGILE

Collaboration

•

A. Giuliani

Aug, 2009

5 pages

Published in:

Astrophys.J.Lett. 708 (2009) L84-L88

e-Print:

0908.1908 [astro-ph.HE]

DOI:

10.1088/2041-8205/708/2/L84

Experiments:

AGILE

View in:

ADS Abstract Service

reference search49 citations

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Abstract: (arXiv)

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 prompt phase is relatively intense in the 0.3-10 MeV range with a spectrum characterized by a large peak/cutoff energy near 3 MeV, in this phase, no significant high-energy gamma-ray emission is detected. At the end of the prompt phase, intense gamma-ray emission above 30 MeV is detected showing a power-law time decay of the flux of the type t^-1.3 and a broad-band spectrum 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. GRB 090510 provides the first case of a short GRB with delayed gamma-ray emission. 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.

Note:

Accepted by the Astrophysical Journal Letters on September 11, 2009

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