GCN Circular 27240
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We observed the field of GRB 200224A (Ukwatta et al., GCN 27173; Fermi GBM team GCN 27174) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Feb. 26 (UT) 17:24:49. We did not detect the optical afterglow (Sota et al., GCN 27176; Stecklum et al., GCN 27177; Marshall et al., GCN 27182; Becerra et al., GCN 27182; Fernandez et al., GCN 27222). Preliminary photometry of the field is following. Date UT start, t-T0 Filter Exp. OT UL(3sigma) (mid, days) (s) 2020-02-26 17:24:49 2.60348 R 29*120 n/d 22.6 Photometry is based on the USNO-B1.0 nearby stars.