[vsnet-grb-info 2548] GRB 051221A: WSRT Radio Observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Dec 22 19:40:15 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 4385
SUBJECT: GRB 051221A: WSRT Radio Observations
DATE: 05/12/22 10:38:02 GMT
FROM: Alexander van der Horst at U of Amsterdam <avdhorst at science.uva.nl>
A.J. van der Horst (University of Amsterdam) reports on behalf of a larger
collaboration:
"We observed the position of the GRB 051221A afterglow at 4.9 GHz with the
Westerbork Synthesis Radio Telescope at December 21 13.90 UT to 18.63 UT,
i.e. 12.05 - 16.78 hours after the burst (GCN 4363).
We do not detect a radio source within the SWIFT/XRT error circle (GCN
4366), in particular at the position of optical (GCN 4369) and infrared
(GCN 4368) counterparts. The formal flux measurement for a point source at
the position of the optical counterpart is 17 +/- 35 microJy."
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