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SAX J2103.5+4545 Continues to be observable with Swift/BAT

ATEL # 1064; H. A. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), L. Barbier (GSFC), J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC) on behalf of the Swift-BAT team
on 30 Apr 2007; 17:38 UT
Password Certification: Hans A. Krimm (

Subjects: X-ray, Binaries, Neutron Stars, Pulsars

Swift/BAT reports continued detection of the Be/neutron star HMXB SAX J2103.5+4545 which was reported to be in outburst (Galis et al, ATel #1063). The source first became detectable in the 15-50 keV band on April 23, 2007 (MJD 54213), when it was seen at 0.021 +/- 0.004 counts/sec/cm^2 (100 mCrab) in several pointings. It continued to brighten slowly, reaching 150 +/- 16 mCrab in daily averages on April 28 and 29 with peaks as high as 194 +/ 33 mCrab. It continues to be detectable at the same level and the light curve appears to be flattening out. The source has twice triggered Swift/BAT on-board. In a 640-sec exposure starting at 14:04:22 UT on April 23, 2007, the source was seen at 78 mCrab, and in a 128-second exposure starting at 10:59:42 UT on April 25, it was seen at 191 mCrab. Both detections were announced in Swift-BAT Transient Position Notices.

The BAT rates are based on values from the Swift/BAT Hard X-ray Transient Monitor (ATEL #904),

Swift/BAT Hard X-ray transient monitor

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates