[ Previous | Next | ADS ]

Possible radio counterpart to IGR J17091-3624

ATel #152; M. P. Rupen, A. J. Mioduszewski, V. Dhawan (NRAO)
on 23 Apr 2003; 15:38 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)

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

Referred to by ATel #: 1140, 3232

Observations with the Very Large Array (VLA) at 4.9 GHz show a possible radio counterpart to IGR J17091-3624, with a flux density of 1.9+/-0.3 mJy, and a J2000 position of

17 09 02.3 +/- 0.4     -36 23 33 +/- 5
This is about 80 arcseconds from the INTEGRAL position reported by Kuulkers et al. (ATEL #149), and well within their 3 arcminute error circle. This is the only radio source within that error circle (to the limiting rms noise quoted above). There is also no corresponding source in the NRAO VLA Sky Survey (NVSS; Condon et al. 1998, A.J. 115, 1693) at 1.4 GHz, with a nominal flux density at the above position in 1995 of 1.3 mJy/beam, and an rms noise level of 0.6 mJy/beam. This rules out a stable radio source with the steeply falling spectrum typical of many synchrotron emitters, but a flat-spectrum source unrelated to the X-ray transient is still possible. Further VLA observations are planned, and we request observations of this position at other wavelengths.