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H1743-322 X-ray Rise

ATel #576; J. H. Swank (NASA/GSFC), R. Remillard(MIT) & C. B. Markwardt (Univ. MD and NASA/GSFC)
on 11 Aug 2005; 20:41 UT
Credential Certification: Jean Swank (swank@milkyway.gsfc.nasa.gov)

Subjects: X-ray, Black Hole, Transient

Referred to by ATel #: 593, 1739

RXTE observations show that H1743-322 = IGR J1746-3213 = XTE J17464-3213 is again active in X-rays as well as radio (see Atel #575). The source was below the ASM 3-sigma day average sensitivity limit on Aug 5, but on Aug 6 the ASM saw a day average of 21(8)mCrab. A PCA scan on Aug 7, 13:20 UTC confirmed that the source was on, detecting 27.4(1.2) mCrab, 2-10 keV. On Aug 10, at 10:36 UTC, the PCA found that the source had risen to 57.0(1.8) mcrab. On Aug 11, the ASM day average was 64(7) mCrab. The rate of rise over 4 days was half those of the outbursts in July 2004 and March 2003. Further RXTE observations are being planned.