Radio observations of H1743-322 = IGR J1746-3213 = XTE J17464-3213
ATel #304; M. P. Rupen, V. Dhawan, A. J. Mioduszewski (NRAO)
on 11 Jul 2004; 22:55 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)
Subjects: Radio, X-ray, Binary, Star, Transient, Variables
Referred to by ATel #: 314
We report Very Large Array (VLA) observations of the black hole candidate
binary H1743-322 = IGR J1746-3213 = XTE J17464-3213, currently undergoing
an X-ray outburst (ATEL #301). Data taken on 11 July 2004 show no detections
at 4.86 and 8.46 GHz, with nominal flux densities at the position of the
source of 0.17 +/- 0.23 mJy/beam and 0.10 +/- 0.08 mJy/beam respectively.
Observations on 27 June 2004 also showed no source, the nominal flux density
being 0.07 +/- 0.07 mJy/beam at 8.46 GHz. Regular monitoring observations
at one to two week intervals gave a possible (3sigma) detection of the core
on 9 April 2004 (0.15 +/- 0.05 mJy/beam at 4.86 GHz). The last clearly
believable detection was however towards the end of the X-ray hard state
(ATEL #198), on 6 November 2003, when the flux density was 0.22 +/- 0.04 mJy
at 4.86 GHz. Further radio observations are planned at few-day to weekly
intervals.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities, Inc.