GCN Circular 1100
Subject
GRB010921 field photometry
Event
Date
2001-09-22T18:08:47Z (24 years ago)
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 UBVRcIc all-sky photometry for
an 11x11 arcmin field that covers the center of the
error box for GRB010921 (GCN 1096,1097) with the USNOFS 1.0-m telescope
on one photometric night. Stars brighter than
V=13.5 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/grb010921.dat
The current photometry has a potential external zero-point
error of about two percent. The astrometry in this file
is based on linear plate solutions with respect to USNO-A2.0.
The internal errors are less than 100mas.
Further calibration of this field will be performed if
an optical afterglow is identified.