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Swift/BAT confirms the outburst from 2S 1417-624

ATEL # 2276; 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), T. Sakamoto (CRESTT/GSFC/UMBC), G. Skinner (CRESST/GSFC/UMD), M. Stamatikos (OSU/GSFC), J. Tueller (GSFC), T. Ukwatta (GSFC/GWU)
on 30 Oct 2009; 20:06 UT
Password Certification: Hans A. Krimm (

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

As part of its hard X-ray transient monitor program, the Burst Alert Telescope on Swift has detected a brightening of the high-mass X-ray binary and binary pulsar 2S 1417-624 which confirms the results recently reported from the Fermi/GBM (Beklen & Finger, ATel #2275). The source first became detectable on 14-Oct-2009, rising to a peak daily average brightness of 0.019 0.002 counts/s/cm2, corresponding to ~85 mCrab in the 15-50 keV band, on 30-Oct-2009 (MJD 55134). This flux level is considerably above the peak reached during the last reported outburst of this source in Nov. 1999 (16 mCrab; M. Finger, ATel #52) and the INTEGRAL observations reported in July 2008 (11.3 mCrab; A. Manousakis et al, ATel #1613). In the BAT monitor, the source is normally at a level of 1.6 mCrab.

Examination of the RXTE All-Sky Monitor light curves also show an increase in the 2-10 keV band to 2.0 0.25 counts/sec on MJD 55132.

Swift/BAT Transient Analysis for H 1417-624

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R. E. Rutledge , Editor
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