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H1743-322 re-appears

ATel #575; M. P. Rupen (NRAO/GSFC), A. J. Mioduszewski, V. Dhawan (NRAO)
on 11 Aug 2005; 16:57 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)

Subjects: Radio, Infra-Red, Optical, X-ray, Binary, Black Hole, Transient

Referred to by ATel #: 576, 593

Very Large Array (VLA) observations of the black hole candidate binary H1743-322 = IGR J1746-3213 = XTE J17464-3213 (e.g., ATel #301, #314) show that the central radio source has re-appeared. Data taken on August 7, 2005 (MJD 53589.25) at 4.86 GHz gave a clear detection with a flux density of 0.59 +/- 0.07 mJy; data taken at the same frequency on June 11 (MJD 53532.30) gave only an upper limit, with a nominal flux density at the source position of 0.03 +/- 0.04 mJy/beam. Further VLA observations are planned -- see

http://www.aoc.nrao.edu/~mrupen/XRT/vla_aug05.html
for the likely dates. Given the activity seen in previous outbursts, we urge parallel observations at other wavelengths, particularly in the optical/IR and X-ray bands.

The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.