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.

AGILE detection of delayed gamma-ray emission from the short gamma-ray burst GRB 090510

PREST, MICHELA;
2010-01-01

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 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.
2010
Agile; gamma ray burst; timing and spectral analysis
Giuliani, Andrea; Fuschino, F; Vianello, G; Marisaldi, M; Mereghetti, S; Tavani, Marco; Cutini, Sara; Barbiellini Amidei, Guido; Longo, Francesco; Moretti, Elena; Feroci, Marco; Del Monte, Ettore; Argan, A; Bulgarelli, A; Caraveo, Patrizia; Cattaneo Paolo, Walter; Chen, Aw; Contessi, T; D'Ammando, F; Costa, E; De Paris, G; Di Cocco, G; Donnarumma, I; Evangelista, Yuri; Ferrari, A; Fiorini, Massimiliano; Galli, M; Gianotti, F; Labanti, C; Lapshov, I; Lazzarotto, F; Lipari, Paolo; Morselli, Aldo; Pacciani, Luigi; Pellizzoni, A; Perotti, F; Piano, Giovanni; Picozza, Piergiorgio; Pilia, Maura; Pucella, Gianluca; Prest, Michela; Rapisarda, Massimo; Rappoldi, Andrea; Rubini, Alda; Sabatini, Sabina; Scalise, E; Striani, Edoardo; Soffitta, P; Trifoglio, M; Trois, A; Vallazza Erik, Silvio; Vercellone, S; Vittorini, V; Zambra, A; Zanello, Dino; Pittori, Carlotta; Verrecchia, F; Santolamazza, P; Giommi, P; Colafrancesco, Sergio; Antonelli Lucio, Angelo; Salotti, L.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11383/1737402
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