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Short gamma-ray bursts (GRBs), typically lasting less than 2 s, are a specialclass of GRBs of great interest. We report the detection by the AGILE satelliteof the short GRB 090510 which shows two clearly distinct emission phases: aprompt phase lasting ~ 200 msec and a second phase lasting tens of seconds. Theprompt phase is relatively intense in the 0.3-10 MeV range with a spectrumcharacterized by a large peak/cutoff energy near 3 MeV, in this phase, nosignificant high-energy gamma-ray emission is detected. At the end of theprompt phase, intense gamma-ray emission above 30 MeV is detected showing apower-law time decay of the flux of the type t^-1.3 and a broad-band spectrumremarkably different from that of the prompt phase. It extends from sub-MeV tohundreds of MeV energies with a photon index alpha ~ 1.5. GRB 090510 providesthe first case of a short GRB with delayed gamma-ray emission. We present thetiming and spectral data of GRB 090510 and briefly discuss its remarkableproperties within the current models of gamma-ray emission of short GRBs.

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