GCN Circular 11162
E. Klunko, I. Korobtsev (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the Swift GRB 100901A (Immler et al., GCN 11159) with AZT-33IK telescope of Sayan observatory (Mondy) starting Sep. 01 (UT) 13:44:30. We confirm the afterglow candidate (Immler et al., GCN 11159; Guidorzi et al., GCN 11160) at the following preliminary position (J2000) RA=01 49 03.29 Dec +22 45 30.0. We clearly detect the afterglow in single images of 60 s exposure obtained in R-filter. Observations are continuing.