GCN Circular 11707
Subject
GRB 110213A: ROTSE-III Detection of Optical Counterpart
Date
2011-02-13T05:44:46Z (13 years ago)
From
Brad Schaefer at LSU <schaefer@grb.phys.lsu.edu>
W. Rujopakarn (Steward), B. E. Schaefer (Louisiana State), E.S. Rykoff
(LBNL), report on behalf of the ROTSE collaboration:
ROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB
110213A (Swift trigger 445414). The first image was at 05:17:56.7 UT, 27.1
s after the burst (0.7 s after the GCN notice time). The unfiltered images
are calibrated relative to USNO A2.0. We detect a 15.8 magnitude, fading
source with coordinates:
02:51:51.11 +49:16:20.57 (J2000), with positional uncertainty of 1' or
better
start UT mag mlim(of image)
----------------------------------
05:17:56.7 15.8 17.0
This source is not visible in DSS (second epoch), 2MASS or the MPChecker
database.
Our light curve shows a beautiful rise starting 100 seconds after the
Swift trigger, reaching a peak around 14.5 mag at 200 seconds after the
trigger and then starting a fast decline. Continuing observations are in
progress.