GCN Circular 31233
Subject
GRB 211211A: AbAO optical observations
Event
Date
2021-12-15T15:44:10Z (4 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
N. Pankov (HSE, IKI), A. Pozanenko (IKI), S. Belkin (IKI), R. Ya.
Inasaridze (AbAO), D. Datashvili (AbAO), V. R. Ayvazian (AbAO), G. V.
Kapanadze (AbAO) report on behalf of GRB IKI FuN:
We observed the field of GRB 211211A (Fermi team GCN 31201, D'Ai et al.
GCN 31202; Mangan et al. GCN 31210; Tamura et al. GCN 31226) with AS-32
telescope of Abastumani observatory (AbAO) in R-filter on 2021-12-13
(UT) 02:21:44 and 2021-12-14 (UT) 01:49:33.
In the first epoch we marginally detected an afterglow (Zheng and
Filippenko GCN 31203; Jiang et al. GCN 31213; Strausbaugh et al. GCN
31214; Ito et al. GCN 31217; de Ugarte Postigo et al. GCN
31218,31228,31229; Malesani et al. GCN 31221; Belles et al. GCN 31222;
Kumar et al. GCN 31227). In the second epoch we obtained only an upper
limit.
Preliminary photometry of the field is following
Date UT start t-T0 Filter Exp. OT Err. UL(3sigma)
(mid, days) (s)
2021-12-13 02:21:44 1.56233 R 36*60 21.6 S/N=3 21.6
2021-12-14 01:49:33 2.52748 R 43*60 n/d n/d 21.8
The photometry is based on the nearby SDSS stars:
SDSS-DR12
RA DEC R(Lupton transfoemations)
14:09:08.84448 +27:53:54.5604 15.833
14:09:04.53240 +27:54:10.4760 16.701
14:08:57.03480 +27:54:50.2632 17.677
14:08:57.87816 +27:55:06.0924 17.805
14:09:03.80928 +27:55:56.5464 17.104
14:09:07.89072 +27:55:43.9968 18.640