GCN Circular 1480
Subject
Early Time Limits for GRB020813
Date
2002-08-13T22:29:44Z (22 years ago)
From
Eli Rykoff at Univ. of Michigan/ROTSE <erykoff@umich.edu>
E. Rykoff, D. Smith on behalf of the ROTSE Collaboration, report:
"ROTSE-IIIa responded automatically to GRB020813 (HETE trigger 2262) and started
imaging at 13 August 2002 02:48:48.50 UT, 4.48 minutes after the start of the
burst, and 15 seconds after receipt of GRB coordinates from the GCN. This
response was during early twilight at Los Alamos National Laboratory, and our
first several images were saturated by bright sky. Our first usable exposure, 60
seconds in duration beginning at 03:02:36.28, shows no optical transient to an
unfiltered limiting magnitude ~ 16.0 under adverse conditions. Our typical limit
is several magnitudes deeper. This limit is around 0.5 magnitude brighter than
the extrapolation of the decay of the OT as reported by Li, et. al. (GCN
circular 1473)."
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