GCN Circular 2899
Subject
GRB041223: ROTSE-III Optical Observations
Event
Date
2004-12-23T20:08:44Z (21 years ago)
From
Eli Rykoff at Univ. 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 GRB041223 (GCN #2898). A manual response was
initiated at 18:27 UT, around 4.5 hours after the burst. We took 10 5-s
exposures followed by 200 20-s exposures. The first images were taken
during twilight, and all the images were taken with >90% moon
illumination. The unfiltered images were calibrated relative to USNO
A2.0. Individual images had limiting magnitudes around 16.8. Comparison
to DSS (second epoch) reveals no new sources within the 3-sigma error
circle to a limiting magnitude of 18.4 for a stack of the first 90 images.