INTEGRAL detects the hard X-ray brightening of 4U 1630-47

Details INTEGRAL detects the hard X-ray brightening of 4U 1630-47 INTEGRAL detects the hard X-ray brightening of 4U 1630-47

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012atel.3945....1b&link_type=abstract

The Astronomer's Telegram, #3945

Astronomy and Astrophysics

Astronomy

X-Ray, Binary, Black Hole, Transient

Scientific paper

Hard X-ray monitoring observations by INTEGRAL of the Norma Arm region show that the X-ray binary and black-hole candidate 4U 1630-47 has brightened in the hard X-rays (>18 keV) which could indicate the start of a possible state transition since its X-ray outburst of 2011 December (ATel #3830). During INTEGRAL revolution 1143 (2012 Feb. 22), 4U 1630-47 was detected by both JEM-X (~56 sigma) and ISGRI (~ 9 sigma) at fluxes of 350+-6 mCrab (3-10 keV), 58+-10 mCrab (10-25 keV), and 14+-1 mCrab (18-40 keV).

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