TITLE: GCN CIRCULAR NUMBER: 8089 SUBJECT: GRB 080810: Observations from NOT DATE: 08/08/11 07:15:29 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (ESO), C.C. Thoene, J.P.U. Fynbo, J. Hjorth (DARK/NBI), P. Jakobsson (U. Hertfordshire), Z. Banhidi (NOT, IAC), F. Grundahl, T. Arentoft (U. of Aarhus) report on behalf of a larger collaboration: We have observed the afterglow of GRB 080810 (Page et al. GCN 8080) from the Nordic Optical Telescope (NOT, Roque de los Muchachos Observatory, La Palma, Spain) using ALFOSC. The observations started on 10.9899 Aug (10.59 hours after the burst), when we measure an R-band magnitude of 19.1+/-0.2 (based on USNO-1B photometry). This value is in agreement with the slope decay measured by Rykoff (GCN 8084) implying that no break has been produced between both observations. This is also consistent with the magnitudes reported by Burenin et al. (GCN 8088). We obtained the following coordinates for the afterglow (J2000+/-0.5"): R.A.: 23:47:10.51 Dec.: +00:19:11.3 This value is slightly off from the value provided by UVOT (Page et al. GCN 8080) but fully consistent with the one given by Rykoff (GCN 8084). We also obtained spectroscopic observations of the afterglow, where we clearly detect Ly-alpha absorption, a flux drop blueward of the Lyman break as well as other absorption lines, including the CIV/CIV doublet at a redshift of z~3.35, in agreement to what was reported by Prochaska et al. (GCN 8083) and Burenin et al. (GCN 8088).