TITLE: GCN CIRCULAR NUMBER: 30309 SUBJECT: GRB 210619B: Even further SAO RAS optical observations DATE: 21/06/23 13:34:33 GMT FROM: Moskvitin Alexander at SAO RAS A. S. Moskvitin and O. A. Maslennikova (SAO RAS), report on behalf of the GRB follow-up team. We observed the field of Swift GRB 210619B (D'Avanzo et al., GCNs #30261, #30288, #30289; Jelinek et al., GCNs #30263, #30281; Lipunov et al., GCN #30259; Zhao et al., GCN #30261; Kong et al., GCN #30265; Axelsson et al., #GCN 30270; de Ugarte Postigo et al., GCN #30272; Zheng et al., GCN #30273; Blazek et al., GCN #30274; Kann et al., GCN #30275; Svinkin et al., GCN #30276; Xin et al., GCN #30277; Perley et al., GCN #30271, Shrestha et al., GCN #30280, Kumar et al. GCN #30286; Cunningham et al., GCN #30290; Romanov, GCN #30291; Hu et al., GCN #30293; Zhu et al., GCN #30294; Belkin et al., GCN #30299; Atteia, GCN #30301, Minaev et al., GCN #30304; Romanov & Lane, GCN #30305; Karpov et al., GCN #30308) with the SAO RAS 1-m telescope Zeiss-1000 + CCD-photometer. We obtained 12 x 300 sec. frames in Rc band on June 22 (22:26:19--23:45:27 UT), T_mid-T0 = 2.96283d. The OT is clearly detected in the stacked frame with the brightness R = 21.4 +/- 0.1 (based on nearby USNO-B1 stars).