TITLE: GCN CIRCULAR NUMBER: 31233 SUBJECT: GRB 211211A: AbAO optical observations DATE: 21/12/15 15:44:10 GMT FROM: Alexei Pozanenko at IKI, Moscow 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