AGILE Detection of Delayed Gamma-ray Emission From the Short Gamma-Ray Burst GRB 090510
2010 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, Vol. 708, no 2, L84-L88 p.Article in journal (Refereed) Published
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 similar to 200 ms 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 broadband spectrum remarkably different from that of the prompt phase. It extends from sub-MeV to hundreds of MeV energies with a photon index alpha similar or equal to 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.
Place, publisher, year, edition, pages
2010. Vol. 708, no 2, L84-L88 p.
gamma rays: bursts
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:kth:diva-85823DOI: 10.1088/2041-8205/708/2/L84ISI: 000273308000004OAI: oai:DiVA.org:kth-85823DiVA: diva2:500364
QC 201202172012-02-132012-02-132012-02-17Bibliographically approved