TITLE: GCN CIRCULAR NUMBER: 16168 SUBJECT: GRB 140419A: Continued Mondy optical observations DATE: 14/04/24 15:28:48 GMT FROM: Alexei Pozanenko at IKI, Moscow 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 continued observation of the Swift GRB 140419A (Marshall et al., GCN 16118) with AZT-33IK telescope of Sayan observatory (Mondy) on Apr. 19-21. We took several images in R-filter. On a stacked image we clearly detected the optical afterglow (Zheng et al., GCN 16119; Guver et al., GCN 16120; Butler et al., GCN 16121; Kuin et al., GCN 16123; Hentunen et al., GCN 16126). Details of a photometry are the following: date UT start t-T0 Filter Exp. OT (mid, days) (s) 2014-04-22 14:49:26 3.45342 R 120*60 22.18 +/- 0.09 The photometry is based on nearby SDSS star, R (gri -> R transformations by Lupton 2005): SDSS id R J082752.69+461357.4 17.381 ± 0.018