Swift/BAT reports an increase in flux from MAXI J1836-194
ATel #3966; 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 (GSFC), D. Palmer (LANL), T. Sakamoto (CRESTT/GSFC/UMBC), G. Skinner (CRESST/GSFC/UMD), M. Stamatikos (OSU/GSFC), J. Tueller (GSFC), T. Ukwatta (GSFC/MSU)
on 14 Mar 2012; 19:35 UT
Credential Certification: Hans A. Krimm (Hans.Krimm@nasa.gov)
Subjects: X-ray, Binary, Black Hole, Neutron Star, Transient
The Swift/BAT hard X-ray transient monitor reports a rebrightening of the black
hole candidate MAXI J1836-194 (Negoro et al, ATel #3611) in the 15-50 keV band.
The source has increased in intensity from an undetectable level of
approximately 0.006 cts/cm^2/sec (~10 mCrab) on 2012 March 10 to a level of
0.0033 +/- 0.001 (~15 mCrab) on 2012 March 14 (MJD 56000). It has been
detectable at roughly the same level since March 12, so it is not clear whether it is continuing to brighten
This source was discovered in August 2011 (Negoro et al, ATel #3611) and reached
a peak rate in the BAT transient monitor of 0.016 +/- 0.001 cts/cm^2/sec (~75
mCrab) on 2011 Sep. 6 (MJD 55810). It remained detectable in the BAT until 2011
Nov. 27.
The most recent point in the Swift/XRT light curve, from 2012 Feb. 22, showed
that the source was undetectable in the XRT at that time, with a 0.3-10 keV rate
of 0.0023 +/- 0.0019 ct/s.
BAT hard X-ray transient monitor light curve for MAXI J1836-194
