TITLE: GCN CIRCULAR NUMBER: 28856 SUBJECT: GRB 201104B: Kitab optical observations DATE: 20/11/06 17:01:34 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Zhornichenko (KIAM), A. Pozanenko (IKI), V. Agletdinov (KIAM), Sh. Ehgamberdiev (UBAI) report on behalf of IKI-GRB-FuN: We observed the field of GRB 201104B (Sbarufatti et al., GCN 28825) with Kitab-ISON RC-36 telescope in Clear filter. Observation started on Nov. 4 (UT) 18:44:28, i.e. 77 minutes after trigger. The optical afterglow (Marshall et al., GCN 28827; Vielfaure et al., GCN 28840; Oates et al., GCN 28851) at redshift z = 1.954 (Vielfaure et al., GCN 28840) is marginally (S/N = 1.8) detected in stacked image. Preliminary photometry of the afterglow is following. Date, UT start, t-T0, Exp., Filter, OT, S/N UL(3 sigma) (mid, days) 2020-11-04 18:44:28 0.0741 72*60 CR 20.4 1.8 20.0 The photometry is based on nearby USNO-B1.0 stars, R magnitude. USNO-B1.0_id R2 0979-0003163 17.51 0979-0003223 17.47