TITLE: GCN CIRCULAR NUMBER: 10205 SUBJECT: GRB 091127: Further NOT optical observations DATE: 09/11/28 23:09:07 GMT FROM: Dong Xu at DARK,NBI D. Xu (WIS, DARK/NBI), D. Malesani, J. Hjorth (DARK/NBI), P. Jakobsson (Univ. of Iceland), A. Carmona, C. Baldovin-Saavedra (ISDC & Geneva Observatory) report on behalf of a larger collaboration: We continued to observe the field of GRB091127 (Troja et al., GCN 10191; Smith et al., GCN 10192; Immler et al., GCN 10193) at the Nordic Optical Telescope equipped with StanCam. Among a series of observations, a 60 s R-band frame was obtained staring at 21:51:50 UT on Nov. 28th, 22.4347 hr after the burst trigger. The optical afterglow is clearly detected in the frame. The magnitude is R=18.95+/-0.04, calibrated with the reference star #0710-0025176 (R2=14.02) in the USNO B1 catalog. Comparison with our previous observation (Xu et al., GCN 10196) indicates a decay slope of ~0.8 between the two epochs.