TITLE: GCN CIRCULAR NUMBER: 11121 SUBJECT: GRB 100814A: NOT optical observations DATE: 10/08/17 09:33:24 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani, J.P.U. Fynbo (DARK/NBI), D. Xu (Weizmann Inst.), P. Jakobsson (Univ. Iceland), L. Buchhave, T. Hansen (NBI), report on behalf of a larger collaboration: We observed the optical afterglow of GRB 100814A (Schaefer et al., GCN 11086; Beardmore et al., GCN 11087) with the NOT equipped with ALFOSC. Observations were carried out in the R band, with a mean time August 17.13 UT (2.97 days after the burst). The optical afterglow is well detected, with R=19.5 compared to several USNO stars in the field. The error is about 0.3 mag, completely due to the scatter in the calibration stars. [GCN OPS NOTE(17aug10): Per author's request, TH was added to the author list.]