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ATEL # 1440; 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 (CRESST/GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (CRESTT/GSFC/UMBC), G. Sato (GSFC/ISAS), G. Skinner (CRESST/GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)
on 22 Mar 2008; 19:25 UT
Distributed as an Instant Email Notice (Transients)
Password Certification: Hans A. Krimm (Hans.Krimm@nasa.gov)
Subjects: X-ray, Request for Observations, Binaries, Pulsars, Transients
The Swift/BAT hard X-ray transient monitor reports an outburst from the galactic HMXB source 1E 1145.1-6141. In the daily average for March 21, 2008 (MJD 54546), 1E 1145.1-6141 reached a flux in the 15-50 keV band of 0.037 ± 0.003 counts/sec/cm2, corresponding to 160 mcrab. This is the brightest of the three outbursts seen during the Swift mission above 90 mCrab (Mar 2005, Nov 2006, and now). The last outburst reported in the literature was 130 mcrab seen by INTEGRAL in June 2004 (Bodaghee et al., ATel #290). The source is believed to be an X-ray pulsar. Its normal rate in the BAT is 10-20 mcrab.
Swift/BAT Hard X-ray Transient Monitor for 1E 1145.1-6141.