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Di Cocco, G. Piano, G. Pucella, G. Vianello, I. Donnarumma, I. Lapshov, L.A. Antonelli, L. Pacciani, L. Salotti, M. Feroci, M. Fiorini, M. Galli, M. Marisaldi, M. Pilia, M. Prest, M. Rapisarda, M. Tavani, M. Trifoglio, P. Caraveo, P. Giommi, P. Lipari, P. Picozza, P. Santolamazza, P. Soffitta, P. W. Cattaneo, S. Colafrancesco, S. Cutini, S. Mereghetti, S. Sabatini, S. Vercellone, T. Contessi, V. Vittorini, Y. Evangelista","submitted_at":"2009-08-13T14:43:03Z","abstract_excerpt":"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. 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