TITLE: GCN CIRCULAR NUMBER: 15713 SUBJECT: GRB 140108A: Mondy optical upper limit DATE: 14/01/10 12:39:53 GMT FROM: Alina Volnova at SAI MSU A. Volnova (IKI), E. Klunko (ISTP), M. Eselevich(ISTP), A. Pozanenko(IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 140108A (Racusin et al., GCN 15699) with AZT-33IK telescope of Sayan observatory (Mondy) starting Jan., 09 (UT) 15:10:20. We obtained several images in R-filter with exposure of 180 seconds. On the stacked image we do not detected the optical afterglow (Gorbovskoy et al., GCN 15701; Gorosabel et al., 15702). The details of the photometry are the following: UT start, t-T0 Filter Exp. OT UL (mid, days) (s) (3 sigma) 15:10:20 0.94627 R 34*180 n/d 22.0 The photometry is based on 3 USNO-B1.0 stars: USNO-B id RA Dec R2 1487-0322168 21:40:30.85 +58:43:53.1 18.18 1487-0322049 21:40:20.16 +58:43:58.3 17.96 1487-0322069 21:40:21.62 +58:45:00.6 17.29