TITLE: GCN CIRCULAR NUMBER: 17489 SUBJECT: GRB 150222A: Mondy optical observations DATE: 15/02/22 22:42:58 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 150222A (Bernardini et al., GCN 17486) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Feb., 22 (UT) 17:48:56. We obtained 37 images in R-filter of 120 s exposure. Within the Swift-XRT error circle (Bernardini et al., GCN 17486) we marginally detected optical source with a magnitude of R=22.15+/-0.25 at 0.06201 days after trigger (mid time). Photometry of the source is based on nearby USNO-B1.0 (R2) stars. At this time we cannot confirm variability or fading nature of the source.