[vsnet-grb-info 3607] GRB051109B: Late-time Radio Observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  5441
SUBJECT: GRB051109B: Late-time Radio Observations
DATE:    06/08/12 19:23:53 GMT
FROM:    Alicia Soderberg at Caltech  <ams at astro.caltech.edu>

A. M. Soderberg (Caltech), D. A. Frail (NRAO) and P. Chandra (UVA/NRAO)
report on behalf of the Caltech-NRAO-Carnegie GRB Collaboration:

"We re-observed the field of GRB 051109B (GCN 4222) centered on the 
revised XRT position (GCN 5387) using the VLA on August 9.5 UT 2006 (t~9 
months after the burst) at a frequency of 1.43 GHz.  Comparison with our 
previous VLA observations (GCN 4245) reveals no new sources within the 
revised XRT error circle.  We place a 3-sigma limit of 0.21 mJy. 
Adopting a redshift of z=0.08 for the putative host galaxy (GCN 5387), 
this limit corresponds to a radio luminosity 100 times fainter than that 
observed for GRB 030329 at a comparable epoch (Frail et al. 2003, ApJ, 
619, 944).

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