GRO J1008-57 entering a new outburst at hard X-rays

ATel #1619; Y. Evangelista, I. Donnarumma, E. Del Monte, M. Feroci, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, A. Argan, A. Trois , M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini (INAF/IASF Roma), A. Chen, S. Vercellone, A. Giuliani, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo (INAF/IASF Milano), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Cattaneo (INFN Pavia), C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia, P. Giommi (ASDC) and L. Salotti (ASI)
on 18 Jul 2008; 11:31 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Marco Feroci (marco.feroci@iasf-roma.inaf.it)

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During the current AGILE pointing at the Vela region, started on 2008 June 30, SuperAGILE detects increasing hard X-ray emission from the Be transient binary pulsar GRO J1008-57, usually below the detection threshold on day-timescale. In the 20-60 keV energy range the source was detected at 30 mCrab level in the 24 hours starting on 2008 July 15 09:00 UT. In the subsequent 24 hours the average flux increased to 45 mCrab, and in the last 24 hours it rose to about 65 mCrab. The last reported outburst from this source dates to November 2007 (Krimm et al., ATel #1298, Wilms et al. ATel #1304), thus the time of the ongoing outburst confirms the good agreement between the recurrence time of outbursts and the proposed binary period of about 248 days (e.g., Coe et al., 2007, MNRAS 378, 1427).