GCN Circular 28708
N. Pankov (HSE), A. Pozanenko (IKI), V. Rumyantsev (CrAO), S. Belkin (IKI), A. Volnova (IKI) report on behalf of IKI GRB FuN: We observed the GRB 201020A (Ambrosi et al., GCN 28696) with ZTSH 2.6m telescope of CrAO observatory starting on Oct. 20 (UT) 16:06:30. The optical afterglow (Ambrosi et al., GCN 28696; Adachi et al., GCN 28697; Fu et al., GCN 28701; Belkin et al., GCN 28703) is clearly detected in R filter. Preliminary photometry of the afterglow in a combined image is following Date UT start t-T0 Filter Exp. OT err UL(3sigma) (mid, days) (s) 2018-10-20 16:06:30 0.42991 R 30*120 20.00 0.10 21.5 The photometry is based on several nearby USNO-B1.0 (R2) stars.