GCN Circular 12190
Subject
GRB 110709B / EVLA detection of radio counterpart
Date
2011-07-21T22:04:14Z (13 years ago)
From
Ashley Zauderer at CfA <bevinashley@gmail.com>
A. Zauderer and E. Berger (Harvard/CfA) report on behalf of a larger
collaboration:
"We observed GRB 110709B (GCN 12122) with the EVLA on several occasions
between 2011 July 11 and 16 UT at a frequency of 5.8 GHz. Within the
XRT error circle (GCN 12136) we find a single unresolved radio source
which brightened by about a factor of 1.6 between 2.1 and 7.0 days after
the burst. The source is located at (J2000):
RA = 10:58:37.114
Dec = -23:27:16.760
The coincidence with the XRT position and the rising flux indicate that
this source is the radio afterglow of GRB 110709B. No optical
counterpart is detected at this position in our Gemini r-band
observations (GCNs 12132, 12155) to a limit of >23.8 mag at 3.2 hours
and >25.1 mag at 4.1 days. Along with the bright X-ray counterpart, the
radio source provides additional support that GRB 110709B is a dark burst.
We thank the EVLA staff for their support of these observations."