TITLE: GCN CIRCULAR NUMBER: 16251 SUBJECT: GRB 140512A: Mondy optical detection DATE: 14/05/12 20:47:05 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Klunko (ISTP), A. Volnova (IKI), M. Eselevich (ISTP), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of GRB 140512A (Pagani et al., GCN 16249) with AZT-33IK telescope of Sayan observatory (Mondy). We took several images in R-filter of 60 s exposure starting on May, 12 (UT) 19:56:58. We clearly detect a fading optical transient in the position reported early (Pagani et al., GCN 16249). A brightness of the OT in the first image is about R=16.7 (at (UT) 19:57:28, mid time). Observation is continuing. The finding chart can be found in http://grb.rssi.ru/GRB140512A/GRB140512A_AZT33IK_R_fc.png