[vsnet-grb-info 257] GRB020531, BVRcIc field photometry

[GCN Circulars <gcncirc@lheawww.gsfc.nasa.gov>]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1422
SUBJECT: GRB020531, BVRcIc field photometry
DATE:    02/06/11 19:41:46 GMT
FROM:    Arne A. Henden at USNO/USRA  <aah@nofs.navy.mil>

A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:

We have acquired BVRcIc all-sky photometry for
an 11x11 arcmin field centered at the IPN coordinates
for the HETE burst GRB020531 (Ricker et al, GCN 1399
and Hurley et al., GCN 1402/1407) with the USNOFS
1.0-m telescope on two photometric nights.  Stars
brighter than V=14.0 are saturated and should be used with care.
We have placed the photometric data on our anonymous ftp site:
ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb020531.dat
The astrometry in this file is based on linear plate solutions
with respect to UCAC2.  The external errors are less than 50mas.

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