Probing the nature of short swift bursts via deep INTEGRAL monitoring of GRB 050925 |
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| Authors: | T Sakamoto L Barbier SD Barthelmy JR Cummings EE Fenimore N Gehrels HA Krimm CB Markwardt DM Palmer AM Parsons G Sato M Stamatikos J Tueller |
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| Institution: | 1. CRESST and NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;2. Joint Center for Astrophysics, University of Maryland, Baltimore County, Baltimore, MD 21250, USA;3. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;4. Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545, USA;5. Universities Space Research Association, Columbia, MD 21044, USA;6. Department of Astronomy, University of Maryland, College Park, MD 20742, USA;g Institute of Space and Astronautical Science, JAXA, Kanagawa 229-8510, Japan;h Oak Ridge Associated Universities, P.O. Box 117, Oak Ridge, Tennessee 37831, USA |
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| Abstract: | We present results from Swift, XMM-Newton, and deep INTEGRAL monitoring in the region of GRB 050925. This short Swift burst is a candidate for a newly discovered soft gamma-ray repeater (SGR) with the following observational burst properties: (1) galactic plane (b = −0.1°) localization, (2) 150 ms duration, and (3) a blackbody rather than a simple power-law spectral shape (with a significance level of 97%). We found two possible X-ray counterparts of GRB 050925 by comparing the X-ray images from Swift XRT and XMM-Newton. Both X-ray sources show the transient behavior with a power-law decay index shallower than −1. We found no hard X-ray emission nor any additional burst from the location of GRB 050925 in ∼5 ms of INTEGRAL data. We discuss about the three BATSE short bursts which might be associated with GRB 050925, based on their location and the duration. Assuming GRB 050925 is associated with the HII regions (W 58) at the galactic longitude of l = 70°, we also discuss the source frame properties of GRB 050925. |
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| Keywords: | Gamma-ray Burst |
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