TITLE: GCN CIRCULAR NUMBER: 16281 SUBJECT: GRB 140419A: Continued Mondy optical observations DATE: 14/05/16 15:49:12 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. 25-26. We took several images in R-filter with the exposure of 60 seconds. On a stacked image from Apr. 25 we detect 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). On the stacked frame from Apr. 26 in the Swift/XRT error circle (Osborne et al., GCN 16124) we do not detect any source. Details of a photometry are the following: date UT start t-T0 Filter Exp. OT (mid, days) (s) 2014-04-25 14:48:25 6.47713 R 90*60 22.81+/-0.17 2014-04-26 14:21:55 7.45841 R 90*60 >21.7 (3 sigma) 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