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
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.
