TITLE: GCN CIRCULAR NUMBER: 16138 SUBJECT: GRB140419A: NOT optical observations DATE: 14/04/21 17:59:57 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK/NBI), T. Kruehler (ESO), N. Tanvir (U. Leicester), F. Taddia, C. Fremling (Stockholm U.) report on behalf of a larger collaboration: We observed the optical afterglow of GRB 140419A (Marshall et al., GCN 16118; Zheng et al., GCN 16119; Kuin et al., GCN 16123) using the 2.5 Nordic Optical Telescope equipped with ALFOSC. We obtained 4x300s, 3x300s, 4x200s frames in the SDSS g-, r-, and i-filters, respectively, with floating clouds, starting at 23:10 UT on 2014-04-20 . Photometry is calibrated with nearby SDSS stars, and results are as follows: Tmid-T0(hr) Mag MagErr 43.24 >22.5 43.54 23.16 0.15 43.86 >20.3 Compared with previous measurements (e.g., from RATIR and KAIT), the afterglow may be decaying more quickly.