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Radio counterpart to IGR J17464-3213 = XTE J17464-3213

ATel #137; M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO)
on 2 Apr 2003; 17:46 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)

Subjects: Radio, X-ray, Gamma Ray, Request for Observations, Binary, Black Hole, Transient

Referred to by ATel #: 138, 140, 180, 301

M.P. Rupen, A.J. Mioduszewski, and V. Dhawan (National Radio Astronomy Observatory [NRAO]) report the detection of a probable radio counterpart to the the X-ray transient and black hole candidate IGR J17464-3213 = XTE J17464-3213 (ATEL #132; ATEL #133). Observations with the Very Large Array (VLA) on 30 March and 1 April 2003 UT show a compact, variable source at 17 46 15.61 +/- 0.01s, -32 13 59.9 +/- 1" (J2000), roughly two arcminutes from the original INTEGRAL position, and consistent with the position of H1743-322 (ATEL #136). The source was about 4 mJy on 30 March, and had brightened by about 50% on 1 April, while retaining a flat or somewhat rising radio spectrum. Further radio observations are planned, and observations at other wavelengths are urgently requested.