TITLE: GCN CIRCULAR NUMBER: 8174 SUBJECT: GRB 080903: Liverpool Telescope observations DATE: 08/09/03 09:10:06 GMT FROM: Cristiano Guidorzi at INAF-OAB C. Guidorzi (INAF-OAB), R. J. Smith (LJMU), A. Gomboc (U. Ljubljana) on behalf of a larger collaboration report: On 2008 September 03 (03:32:18 UT) we began observing the field of GRB 080903 (Grupe et al. GCN Circ. 8169) with the Liverpool Telescope using the SDSS i filter. We clearly detect the optical afterglow candidate reported by de Ugarte Postigo et al. (GCN Circ. 8172) and Korotkiy et al. (GCN Circ. 8173). We found the following magnitudes: Telescope Filter T_mid[hr] Exposure[s] Mag ------------------------------------------------------------- LT i' 2.59 6x300 21.32 +/- 0.07 LT i' 4.08 6x300 21.52 +/- 0.11 ------------------------------------------------------------- The calibration was performed using the I magnitude of the following nearby USNOB1 catalogue star: 05:47:14.30, +51:15:32.8, using I=14.77.