GCN Circular 2919
Subject
GRB041228: ROTSE-III Optical Observations
Date
2004-12-28T20:03:23Z (20 years ago)
From
Eli Rykoff at U of Michigan/ROTSE <erykoff@umich.edu>
E. Rykoff (U. Michigan) reports on behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to Swift GRB041228 (GCN #2918). An automatic response was
initiated during early twilight hours. The first usable image was taken
at 28 Dec 18:38:44 UT, 7.8 hours after the burst. We took 50 60-s
exposures before the burst position dropped below our minimum observing
elevation. The unfiltered images were calibrated relative to USNO A2.0.
Individual images have limiting magnitudes ranging from 17-18 as the
sky darkened. Comparison to DSS (second epoch) reveals no new sources
within the 3-sigma error circle to a limiting magnitude of 18.8 for
stacks of 10 images taken 8.4 hours after the burst.