GCN Circular 17102
Subject
GRB 141121A: Continued Mondy optical observations
Event
Date
2014-11-26T22:52:46Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich
(ISTP), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger
GRB follow-up collaboration:
We observed the field of GRB 141121A (Lien et al., GCN 17075) with
AZT-33IK telescope of Sayan observatory (Mondy) on Nov., 26 starting on
(UT) 20:16:58. We obtained several images in R-filter. In a combined
image we clearly detect optical afterglow (Tanga et al., GCN 17078;
Perley et al., GCN 17081).
A preliminary photometry is based on nearby SDSS stars:
date UT start t-T0 Filter Exp. OT OT_err
(mid, days) (s)
2014-11-26 20:16:58 5.7120 R 39*120 21.38 0.09
The magnitude of the afterglow decreased about 0.9 mag since our
previous observation (Mazaeva et al., GCN 17093) at 2.74 days after the
burst trigger and thus we confirm gradual steepening of the afterglow
light curve (Butler et al., GCN 17101).