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1A 0535+262 is now three times as bright as the Crab

ATEL # 2336; 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 6 Dec 2009; 20:43 UT
Password Certification: Hans A. Krimm (

Subjects: X-ray, Binaries, Pulsars, Transients
Referred to by ATEL #: 2337

The Swift/BAT hard X-ray transient monitor reports that the current outburst of the accreting transient pulsar 1A 0535+262 (Wilson-Hodge et al, ATel #2324) is a major outburst similar to the one the source underwent in May and June, 2004 (Tueller et al, ATel #504). The daily average source rate on 2009-Dec-06 (MJD 55171) in the 15-50 keV band is 0.69 +/- 0.024 ct/s/cm^2, corresponding to 3.1 times the flux from the Crab in the same band. The count rate has been rising steadily since 2009-Nov-25 and has not yet peaked.

Swift/BAT Hard X-ray Transient light curve for Swift 1A0535+262

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