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SuperAGILE detects an X-ray burst from SAX J1750.8-2900

ATel #1775; L. Pacciani, E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, M. Rapisarda, P. Soffitta, A. Argan, A. Trois , M. Tavani, G. Piano, G. Pucella, F. D'Ammando, V. Vittorini (INAF/IASF Roma), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), A. Chen, S. Vercellone, A. Giuliani, S. Mereghetti, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo (INAF/IASF Milano), A. Pellizzoni (OAC/INAF Cagliari), 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), A. Rappoldi (INFN Pavia) and C. Pittori, F. Verrecchia, P. Santolamazza, B. Preger, P. Giommi (ASDC) and L. Salotti (ASI)
on 10 Oct 2008; 13:33 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Marco Feroci (marco.feroci@iasf-roma.inaf.it)

Subjects: Binary, Neutron Star, Transient

Referred to by ATel #: 1777

While pointing at the Galactic Center region, SuperAGILE detected an X-ray burst from a position consistent with the neutron star transient SAX J1750.8-2900. This source was recently reported by Linares et al. (ATel #1662) as returning to a quiescent state, based on a Swift/XRT observation on August 14th 2008 (ATel #1662), after a long outburst started on March 2008 (Markwardt & Swank, ATel #1425), during which also SuperAGILE detected the source at hard X-rays at a flux level of about 80 mCrab (Pacciani et al., ATel #1428). The observed X-ray burst lasted approximately 60 sec, starting on 9 October 2008 at 21:26:04 UT. The average flux in the 17-25 keV energy range was about 2.3 Crab, while no significant signal is detected above 25 keV. A search in the SuperAGILE data in the 60 and 600 sec preceding and following the burst provided no evidence of prolonged source activity. The source is currently not detected by SuperAGILE in the standard 20-60 keV energy range, on a daily timescale, with a 3-sigma upper limit of about 20 mCrab.