GCN Circular 479
Subject
GRB991216
Date
1999-12-17T23:34:27Z (25 years ago)
From
Craig Wheeler at U.Texas <wheel@astro.as.utexas.edu>
D. Andrew Howell, Michael Ward, Lifan Wang, and J. Craig Wheeler of the
University of Texas at Austin report:
The field of GRB991216 was imaged with the 0.8m telescope Prime Focus
Camera at McDonald Observatory. Three 0.49 sq. deg. 600s Rc exposures
were obtained centered on the RXTE position reported by Takeshima et al.
The images were taken at Dec 17.153, 17.162, and 17.173 UT under conditions
of intermittent clouds and high cirrus, with a very rough limiting
magnitude of 19.2. The OT reported by Uglesich et al. (GCN Circular #472)
is confirmed, but is so near our magnitude limit that reliable photometry
cannot be done. We can say that from visual inspection the OT appears
brighter than most stars listed at 19.1 magnitude in the USNO (red)
catalog, but fainter than stars around 18.5 (the USNO red photgraphic
magnitudes are derived from scans of POSS-I plates and highly uncertain).
Therefore our data are consistent with the first epoch data reported
by Uglesich et al. (R=18.8 at Dec. 17.142).
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