2003IAUC.8105....3R

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 blackhole candidate IGR J17464-3213 = XTE J17464-3213 (Revnivtsev et al. 2003, http://atel.caltech.edu/?read=132; Markwardt and Swank 2003, http://atel.caltech.edu/?read=133). Observations with the Very Large Array (VLA) on Mar. 30 and Apr. 1 UT show a compact, variable source at R.A. = 17h46m15s.61 ± 0s.01, Decl. = -32o13'59".9 ± 1" (equinox 2000.0), roughly 2' from the original INTEGRAL position and consistent with the position of H1743-322 (Gursky et al. 1978, Ap.J. 223, 973). The flux densities on Mar. 30 (after correcting for primary beam attenuation) were 3.5 ± 0.2 mJy at 4.9 GHz and 4.6 ± 0.2 mJy at 8.5 GHz. By Apr. 1, the source had brightened by about 50 percent, while retaining a flat or somewhat rising spectrum: 1.4 GHz, 7.8 ± 1.5 mJy; 4.9 GHz, 6.0 ± 0.3 mJy; 8.5 GHz, 6.6 ± 0.2 mJy; 14.9 GHz, 6.9 ± 0.6 mJy. The NRAO VLA Sky Survey (NVSS; Condon et al. 1998, A.J. 115, 1693) shows no source at 1.4 GHz in 1995, in an image with an rms noise of 0.45 mJy/beam. Further radio observations are planned, and observations at other wavelengths are urgently requested.