Agile Detection of Delayed Gamma-Ray Emission from the Short Gamma-Ray Burst GRB 090510
Giuliani, A. · Fuschino, F. · Vianello, G. · Marisaldi, M. · Mereghetti, S. · Tavani, M. · Cutini, S. · Barbiellini, G. · Longo, F. · Moretti, E. · Feroci, M. · Del Monte, E. · Argan, A. · Bulgarelli, A. · Caraveo, P. · Cattaneo, P. W. · Chen, A. W. · Contessi, T. · D'Ammando, F. · Costa, E. · De Paris, G. · Di Cocco, G. · Donnarumma, I. · Evangelista, Y. · Ferrari, A. · Fiorini, M. · Galli, M. · Gianotti, F. · Labanti, C. · Lapshov, I. · Lazzarotto, F. · Lipari, P. · Morselli, A. · Pacciani, L. · Pellizzoni, A. · Perotti, F. · Piano, G. · Picozza, P. · Pilia, M. · Pucella, G. · Prest, M. · Rapisarda, M. · Rappoldi, A. · Rubini, A. · Sabatini, S. · Scalise, E. · Striani, E. · Soffitta, P. · Trifoglio, M. · Trois, A. · Vallazza, E. · Vercellone, S. · Vittorini, V. · Zambra, A. · Zanello, D. · Pittori, C. · Verrecchia, F. · Santolamazza, P. · Giommi, P. · Colafrancesco, S. · Antonelli, L. A. · Salotti, L.
الأصل · EN
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.
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