TITLE: GCN CIRCULAR NUMBER: 29167 SUBJECT: GRB 201223A: Mondy and Kitab optical observations DATE: 20/12/24 13:09:08 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), N. Pankov (HSE), E. Klunko (ISTP), A. Novichonok (Petrozavodsk State University, KIAM), Sh. Ehgamberdiev (UBAI) report on behalf of IKI-GRB-FuN: We observed the field of GRB 201223A (Gropp et al., GCN 29158) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Dec. 23 (UT) 18:29:01 and Kitab-ISON RC-36 telescope starting (UT) 19:25:57. The optical transient (Lipunov et al. GCN 29157; Gropp et al., GCN 29158; Zhu et al. GCN 29159; Hu et al. GCN 29160; Hosokawa et al. GCN 29164; Romanov et al. GCN 29165; Xin et al. GCN 29166) is detected in our stacked images in R-filter. Preliminary photometry of the optical transient in a combined images is following Date UT start t-T0 Filter Exp. OT Err. UL(3sigma) (mid, days) (s) 2020-12-23 18:29:01 0.05943 R 10*120 18.95 0.23 19.5 AZT-33IK 2020-12-23 18:29:01 0.05943 R 55*120 19.38 0.09 22.1 AZT-33IK 2020-12-23 19:25:57 0.08161 R 60*60 19.40 0.20 19.6 RC-36 The photometry is based on the nearby USNO-B1.0 stars USNO-B1.0_id R2 1611-0080890 18.64 1612-0081305 18.44