GCN Circular 17209
Subject
GRB 141221A: LCOGT-McDonald optical afterglow observations
Event
Date
2014-12-21T15:07:45Z (12 years ago)
From
Cristiano Guidorzi at Ferrara U,Italy <guidorzi@fe.infn.it>
C. Guidorzi, S. Dichiara (U. Ferrara), D. Kopac, A. Gomboc (U. Ljubljana)
on behalf of a larger collaboration report:
The 1-m LCOGT McDonald telescope began observing Swift GRB 141221A
(Sonbas et al. GCN 17206) on Dec 21 at 10:26:35 UT, corresponding
to 2.3 hours after the burst trigger, with SDSS r' and i' filters.
We detect the optical afterglow (Sonbas et al. GCN 17206; Covino
GCN 17208) with i'=20.1 +- 0.3 mag at a mid time of 2.61 hours
post burst (total exposure of 600 s).