GRB 200412B: AbAO optical observations

We observed the field of Fermi GRB 200412B (Fermi GBM team GCN 27547; Longo et al., GCN 27557) with AS-32 (0.7m) telescope of Abastumani Observatory starting on 2020-04-12 (UT) 18:42:21. We detected the afterglow of GRB 200412B (Lipunov et al., GCNs 27555; Kumar et al., GCN 27564). Preliminary photometry of the afterglow is following. Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2020-04-12 18:42:21 0.41783 R 56*60 18.31 0.02 21.3 The photometry is based on nearby USNO-B1.0 stars UUSNO-B1.0_id R2 1525-0302108 17.21 1524-0300914 17.20 1525-0301929 17.85 [GCN OPS NOTE(13apr20): Removed the extra "GRB" in the SUBJECT-line.]