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Swift/BAT X-ray monitoring indicates a new outburst of the black hole transient H 1743-322

ATel #10599; Hui Zhang (Shanghai Astronomical Observatory), Wenfei Yu(Shanghai Astronomical Observatory), Zhen Yan(Shanghai Astronomical Observatory), Jie Lin(Shanghai Astronomical Observatory)
on 27 Jul 2017; 04:50 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Hui Zhang (hzhang@shao.ac.cn)

Subjects: X-ray, Binary, Black Hole, Transient

Referred to by ATel #: 10751

H 1743-322 is a black hole X-ray binary with frequent outbursts. Recent Swift/BAT monitoring observations (Krimm et al. 2013) show that this source has turned into a new outburst after been in quiescence for about nine months since the most recent outburst in 2016. The X-ray intensity measured with Swift/BAT increased from 1.4e-3+/-1.3e-3 counts/s/cm^2 (6.0+/-5.8 mCrab , we set 1 Crab=0.23counts/s/cm^2) on MJD57956 to 8.2e-3+/-1.9e-3 counts/s/cm^2 (35+/-8 mCrab) on MJD57960 in the energy band 15-50 keV. This is about 4 sigma above the X-ray flux level in its quiescent state estimated in the data obtained from MJD 57800 to 57900.

We encourage further multi-wavelength observations of this source during the new outburst. We thank the Swift team for making regular X-ray monitoring data public.