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Further radio observations of IGR J00291+5934

ATel #364; M. P. Rupen (GSFC/NRAO), V. Dhawan, A. J. Mioduszewski (NRAO)
on 9 Dec 2004; 20:00 UT
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)

Subjects: Radio, X-ray, Binary, Neutron Star, Transient, Pulsar

Referred to by ATel #: 369, 1660, 1667

Very Large Array (VLA) observations of the millisecond pulsar IGR J00291+5934 (ATEL #352, ATEL #353) give a clear detection with a flux density of 0.17 +/- 0.05 mJy at 4.86 GHz on 9 December 2004 (MJD 53348.354). This flux density basically agrees with that measured by Fender et al. at nearly the same frequency on 6-7 December 2004 (ATel #361), suggesting that any decay is not very rapid. The VLA observation by itself was too short (about one hour) to usefully constrain the short timescale variability. Further observations are planned.

These data were taken in the VLA's most extended (A) configuration, yielding a restoring beam of 0.88 x 0.44 asec (FWHM), oriented 73 degrees east of north. A Gaussian+planar fit to the image gives an upper limit to the size of 0.53 arcsec FWHM, and a J2000 position within 0.2 arcseconds of the optical position given in ATel #354:

00 29 03.0822 +/- 0.0055
+59 34 18.99 +/- 0.04

Here the error bars are statistical based on the noise measured near the source. This position is measured with respect to the ICRF calibrator J0102+5824, which is 4.5 degrees away, and whose position is known to better than 2 milliarcseconds.

The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.