TITLE: GCN CIRCULAR NUMBER: 29210 SUBJECT: GRB 201216C: TSHAO, Terskol, Mondy optical upper limits DATE: 20/12/31 17:43:53 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), M. Krugov (FAI), P. Levkina (INASAN), E. Klunko (ISTP), N. Pankov (IKI, HSE) report on behalf of GRB IKI FuN: We observed GRB 201216C (Beardmore et al., GCN 29061) with Zeiss-1000 (West) telescope of TSHAO, Zeiss-2000 telescope of Terskol observatory, and AZT-33IK telescope of Mondy observatory. The optical afterglow (Izzo et al., GCN 29066; Jelinek et al., GCN 29070; Oates et al., GCN 29071; Shrestha et al., GCN 29085) at possible redshift of z = 1.1 of presumably optically dark GRB (Vielfaure et al., GCN 29077) is not detected in our observations. Preliminary photometry of the field is following. Date UT start t-T0 Filter Exp. OT Err. UL. Telescope (mid, days) (s) 2020-12-17 14:20:49 0.6968 R 60*180 n/d n/d 19.8 Zeiss-1000(W) 2020-12-18 16:47:27 1.7653 R 28*180 n/d n/d 21.9 Zeiss-2000 2020-12-19 12:00:27 2.5681 R 45*120 n/d n/d 22.1 AZT-22 Photometry is based on USNO-B1.0 stars USNO-B1.0_id R2 1065-0011134 15.33 1065-0011173 15.44 1064-0011283 16.67