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ATEL # 1959; H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), W. Baumgartner (CRESST/GSFC/UMBC), J. R. Cummings (CRESST/GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC), C. B. Markwardt (CRESST/GSFC/UMD), D. Palmer (LANL), A. M. Parsons (GSFC), T. Sakamoto (CRESTT/GSFC/UMBC), G. Skinner (CRESST/GSFC/UMBC), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC)
on 11 Mar 2009; 1:17 UT
Password Certification: Hans A. Krimm (Hans.Krimm@nasa.gov)
Subjects: X-ray, Binaries, Pulsars, Transients
As part of its hard X-ray transient monitor program, the Burst Alert Telescope on Swift has detected a brightening of the transient X-ray pulsar Ginga 1843+009. The source first became detectable on March 6, 2009, rising to a peak daily average brightness of 0.018 ± 0.001 counts/s/cm2, corresponding to ~80 mCrab in the 15-50 keV band, on March 10, 2009 (MJD 543900). The highest flux seen in a single Swift pointing was 0.024 ± 0.05 counts/s/cm2 (110 mCrab) in a 744 s observation starting at 21:44:32 UT on March 9, 2009.
This outburst is already brighter than the last two outbursts seen in the BAT monitor (March 2006 -- reported by Swift/BAT in ATel #769; and November 2007) and also brighter than the April 2005 outburst reported by INTEGRAL (ATel #472).
Swift/BAT Transient Monitor light curves for Ginga 1843+009