GCN Circular 1251
Subject
GRB020124 BVRI field photometry
Event
Date
2002-02-17T17:07:21Z (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 BVRcIc all-sky photometry on two photometric
nights with the NOFS 1.0m telescope for an 11x11 arcmin field
that is approximately centered on the error box for
GRB020124 (=H1896; Ricker et al. GCN 1220; IPN triangulation
reported by Hurley et al. GCN 1223). The position of the
optical transient reported by Price et al. (GCN 1221)
is within this field. Stars brighter than
V=13.0 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/grb020124.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.
In particular, the comparison star 34"E and 35" S that was
used to calibrate the Price et al. field can be found in the .dat file
with the following coordinates and magnitudes:
RA = 09:32:53.13 DEC = -11:31:46.0 J2000
B = 17.467 V = 16.896 Rc = 16.537 Ic = 16.182