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Swift reports the discovery of the galactic transient Swift J1910.2-0546

ATel #4139; H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), W. Baumgartner (CRESST/GSFC/UMBC), J. Cummings (CRESST/GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (GSFC), D. Palmer (LANL), T. Sakamoto (CRESTT/GSFC/UMBC), G. Skinner (CRESST/GSFC/UMD), M. Stamatikos (OSU/GSFC), J. Tueller (GSFC), T. Ukwatta (MSU)
on 1 Jun 2012; 02:06 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Hans A. Krimm (Hans.Krimm@nasa.gov)

Subjects: X-ray, Binary, Black Hole, Planet, Transient

Referred to by ATel #: 4140, 4144, 4145, 4146, 4149, 4171, 4195, 4198, 4210, 4246, 4295, 4347, 5063

The hard X-ray transient monitor of the Swift Burst Alert Telescope (BAT) has discovered what is most likely a new galactic transient source.

The source, to which we give the name Swift J1910.2-0546, was first detected by the BAT in a 2-day integration covering the days 2012 May 30 through 31 (MJD 56077- 56078). On May 29, it was not detectable. The BAT rates in the 15-50 keV band were

May 30: 0.0059 +/- 0.001 ct/s/cm^2 (25 mCrab)
May 31: 0.0087 +/- 0.001 ct/s/cm^2 (40 mCrab)

The best BAT position is:

RA = 287.576, Dec = -5.785
Glon= 29.906, Glat = -6.821
The estimated error (statistical plus systematic) is 3 arc minutes (90% confidence)

The source is also detected in the MAXI telescope (event ID 78777285) with a flux of 81 mCrab in the 2-4 keV band. It is at a position consistent within the 1-degree MAXI error: RA = 287.81, dec = -5.75.

We note also that there is a ROSAT source within the BAT error circle: 1RXS J191024.6-054700.

A Swift target of opportunity observation has been requested.

Swift/BAT Hard X-ray Transient light curve for Swift J1910.2-0546