GCN Circular 9809
D. Xu, J.P.U. Fynbo (DARK/NBI), P. Jakobsson (Univ. Iceland), Tiina Liimets (NOT) report on behalf of a larger collaboration: We observed the field of GRB 090814A (Ukwatta et al. GCN 9793; Updike et al., GCN 9794) with the Nordic Optical Telescope equipped with ALFOSC. We obtained 3x600 s R-band frames staring on August 14th, 21:15:11 UT, 20.38 hr after the burst. The optical afterglow is clearly detected in each frame. The magnitude is R~22.4 calibrated against the reference star, #1156-0231252 with R2=19.25, of the USNO B1 catalog. Compared with the previous measurement of R~21.5 around 70 mins after the burst (Jakobsson et al., GCN 9797), the afterglow is decaying quite shallowly, with a power-law slope of ~0.3, being consistent with the X-ray decaying law during the same period (Page & Ukwatta, GCN 9801).