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Strong radio flare in XTE J1746-322 = IGR J17464-3213

ATel #142; M. P. Rupen, A. J. Mioduszewski, and V. Dhawan (NRAO)
on 9 Apr 2003; 01:09 UT
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 #: 314

We report a strong radio flare from the X-ray transient and black hole candidate XTE J1746-322 = IGR J17464-3213 (ATEL #132; ATEL #133) = H1743-322 (ATEL #136; ATEL #138; IAUC 8105 ). Observations with the Very Large Array (VLA) on April 6 and 8 2003 show the source increased in flux density by almost a factor 5 at 4.9 GHz, from 20.1+/-0.3 to 96+/-2 mJy. The radio spectrum also steepened from roughly flat on April 6, to sharply falling with frequency on April 8. The April 8 spectrum is not however well fit by a single power law, as there is substantial excess emission at the higher frequencies. This suggests there are several overlapping components, e.g. an extended, steep-spectrum jet and a compact, flat-spectrum core; it also indicates on-going activity, and the possibility of further radio flares developing.