TITLE: GCN CIRCULAR NUMBER: 10454 SUBJECT: GRB 100213B: Mondy optical observations DATE: 10/02/26 02:54:05 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Klunko (ISTP), A. Volnova (SAI MSU), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the field of GRB 100213B (Vetere et al., GCN 10412) with AZT-33IK telescope of Sayan observatory (Mondy) starting Feb. 14 (UT) 14:54:31. We do not detect any sources in enhanced XRT error circle (Evans, GCN 10423). The upper limit (3 sigma) of stacked image is based on USNO-B1.0 nearby stars: T0+ Filter, Exposure, mag. (mid, d) (s) 0.6801 R 94x30 > 20.80