GCN Circular 3245
Subject
GRB 050412: Optical limit
Date
2005-04-12T13:17:54Z (20 years ago)
From
Ken ichi Torii at RIKEN <torii@crab.riken.go.jp>
K. Torii (Osaka U.) reports
"The error region of GRB 050412 (Cummings, et al. GCN 3237) was
observed with the 0.3-m telescope in the New Mexico Skies observatory.
Imaging through clear filter started at 05:48:13 UT (250-s after trigger)
and 10 frames of 120-s exposure were obtained.
We do not find an optical counterpart to the X-ray source
(Tamburelli, et al. GCN 3241) and derive its 3-sigma upper limit
relative to USNO-A2.0 (R) mag as follows.
MeanEpoch Magnitude Exposure
05:49:13 >18.9 120s
06:00:31 >20.5 10x120s
"