Renewed radio emission from GRO J1655-40
ATel #443; M. P. Rupen (NRAO/GSFC), V. Dhawan, A. J. Mioduszewski (NRAO)
on 18 Mar 2005; 21:01 UT
Credential Certification: Michael P. Rupen (mrupen@nrao.edu)
Subjects: Radio, Binary, Black Hole, Transient
Referred to by ATel #: 487
The radio counterpart to the black hole X-ray binary GRO J1655-40 has again
re-appeared, and is growing stronger (cf. ATEL #441). Observations
taken at 4.86 GHz with the Very Large Array (VLA) showed a 1.77 +/- 0.07 mJy
source on March 16th (13:38 to 14:29 UT), and a 3.6 +/- 0.1 mJy source on
March 18th (12:59 to 13:10 UT). The latter represents the strongest radio
emission so far during the current outburst. The radio emission remains
optically thick, with a flux density at 8.46 GHz of 3.8 +/- 0.2 mJy on
March 18th (13:19-13:26 UT), implying a quite small source.
The full radio light curve is shown at:
http://www.aoc.nrao.edu/~mrupen/XRT/GRJ1655-40/grj1655-40.shtml
This radio re-appearance corresponds to the X-ray hardening visible
in the XTE data (see the Web page referenced in ATEL #440).
Further VLA observations will be added to the Web page referenced above, with
any new surprises 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
