TITLE: GCN CIRCULAR NUMBER: 30299 SUBJECT: GRB 210619B: AbAO optical observations DATE: 21/06/22 12:13:52 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), V. R. Ayvazian (AbAO), G. V. Kapanadze (AbAO), N. Pankov (HSE, IKI) report on behalf of IKI GRB FuN: We observed the field of GRB 210619B (D'Avanzo et al., GCN 30261; Zhao et al., GCN 30264; Axelsson et al., GCN 30270; Svinkin et al., GCN 30276; Levin et al., GCN 30283; Kawakubo et al., GCN 30284) with AS-32 telescope of Abastumani observatory (AbAO) in R-filter on June, 21. The optical afterglow (Lipunov et al., GCN 30259; D'Avanzo et al., GCNs 30261, 30288; Lipunov et al., GCN 30262; Jelinek et al., GCNs 30263, 30281; Kong, GCN 30265; Pellegrin et al., GCN 30268, Perley et al., GCN 30271; Zheng and Filippenko, GCN 30273; Blazek et al., GCN 30274; Kann et al., GCN 30275; Xin et al., GCN 30277; Shrestha et al., GCN 30280; Kumar et al., GCN 30286; Moskvitin et al., GCN 30291; Romanov, GCN 30292; Hu et al., GCN 30293; Zhu et al., GCN 30294) is detected in the stacked image. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err. UL(3sigma) (mid, days) (s) 2021-06-21 23:16:31 1.98931 R 55*60 20.6 0.3 20.6 The photometry is based on the nearby stars: USNO-B1.0 R2 1238-0493928 15.08 1238-0494511 15.67