TITLE: GCN CIRCULAR NUMBER: 16054 SUBJECT: GRB 140129A: Mondy optical observations DATE: 14/03/31 16:05:39 GMT FROM: Alina Volnova at SAI MSU GRB 140129A: Mondy optical observations A. Volnova (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 140129A (Melandri et al., GCN 15760)with AZT-33IK telescope of Sayan observatory (Mondy) starting on on Jan. 29 (UT) 12:21:46. We took several images in R-filter of 60 s exposure. Within enhanced XRT error circle (Evans, GCN 15764) we detected the optical afterglow (Melandri et al., GCN 15760). The details of the photometry are the following: UT start t-T0 Filter Exp. OT (mid, days) (s) 12:21:46 0.38805 R 42x60 21.39 +/- 0.25 The photometry is based 3 SDSS stars, R (gri -> R transformations by Lupton 2005): SDSS id R J023133.01-013533.5 18.121 J023122.45-013411.0 18.797 J023137.01-013606.5 19.143