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GRO J1655-40 radio counterpart fades

ATel #441; M. P. Rupen (NRAO/GSFC), A. J. Mioduszewski, V. Dhawan (NRAO)
on 14 Mar 2005; 20:04 UT
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)

Subjects: Radio, Binary, Black Hole, Transient

Referred to by ATel #: 442, 443

The radio counterpart to the black hole X-ray binary GRO J1655-40 has faded considerably over the past few days. Observations by the Very Large Array (VLA) taken on March 14th, from 12:25 to 12:35 UT, gave no detection, with a nominal flux density at the location of the source of 0.15 +/- 0.14 mJy/beam at 8.46 GHz. The full radio light curve is shown at:


This radio cutoff corresponds to the X-ray rise and softening reported in ATEL #440. Further VLA observations are scheduled for March 16th and 18th; those results will be added to the plot referenced above, and any renewed radio activity will be reported in another Astronomer's Telegram.

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

GRO J1655-40: radio light curves