Swift/BAT detects a new outburst of the blazar Mrk 501
ATel #5224; H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), W. Baumgartner (CRESST/GSFC/UMBC), J. Cummings (CRESST/GSFC/UMBC), N. Gehrels (GSFC), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), D. Palmer (LANL), T. Sakamoto (Aoyama Gakuin Univ.), M. Stamatikos (OSU/GSFC), T. Ukwatta (MSU)
on 24 Jul 2013; 20:17 UT
Credential Certification: Hans A. Krimm (Hans.Krimm@nasa.gov)
Subjects: X-ray, Blazar, Transient
The Swift/BAT hard X-ray transient monitor has recorded a recent flux increase
from the blazar Markarian 501. In the 15-50 keV band, the source first rose
above 3-sigma detectability on 2013 July 17 (MJD 56490) and reached a peak of
0.009 +/- 0.001 ct/s/cm^2 (~40 mCrab) on July 22 before starting to decline
somewhat to 0.005 +\- 0.001 ct/s/cm^2 on July 23. The peak count rate is
comparable to the highest rate seen in the BAT monitor (43 mCrab on 2009
February 27).
Swift/BAT Hard X-ray Transient light curve for Mrk 501
