TITLE: GCN CIRCULAR NUMBER: 28886 SUBJECT: ZTF20acozryr/AT2020yxz (GRB 201103B): CrAO/ZTSh optical observations DATE: 20/11/14 12:26:46 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), V. Rumyantsev (CrAO), N. Pankov (HSE) report on behalf of GRB IKI FuN: We continued observations of the ZTF20acozryr/AT2020yxz (Coughlin et al., GCN 28841) with ZTSh 2.6m telescope of CrAO observatory starting on Nov., 13 (UT) 22:58:04. We detect the optical transient (Coughlin et al., GCN 28841; Xu et al., GCN 28846; Zhu et al., GCN 28854; Mao et al., GCN 28861; Belkin et al., GCNs 28862, 28875, 28883; Mao et al., GCN 28863; Kumar et al., GCN 28876; SungHak et al., GCN 28880) at redshift z = 1.105 (Xu et al., GCN 28847) associated with afterglow of GRB 201103B (Ursi et al., GCN 28831; Svinkin et al., GCN 28844; Evans et al., GCN 28858). Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err. UL. Telescope (mid, days) (s) 2020-11-13 22:58:04 10.21897 R 24*120 21.67 0.16 22.1 ZTSh The photometry is based on the same stars used in GCNs 28862, 28875, 28883.