TITLE: GCN GRB OBSERVATION REPORT NUMBER: 811 SUBJECT: GRB000926: Optical observations DATE: 00/09/29 03:00:25 GMT FROM: Paul Price at RSAA, ANU at CIT P.A. Price, O. Pevunova, B.F. Madore, A. Diercks and J.S. Bloom (Caltech) report on behalf of a larger collaboration: "We have observed the optical transient candidate of Dall et. al. (GCN #804) and Gorosabel et. al. (GCN #803) with the Palomar 60-inch telescope in B, R and I. Photometry was performed relative to the USNO-A2.0 star U1350_09071131 at J2000 coordinates RA 17:04:01.21, Dec +51:46:19.9 (as per Halpern et. al., GCN #806). Results are as follows: Filter Epoch Relative Reference Magnitude B Sep 28.193 2.427 +/- 0.049 mag 17.8 mag 20.227 +/- 0.049 R Sep 28.213 2.934 +/- 0.037 mag 17.1 mag 20.034 +/- 0.037 I Sep 28.173 2.917 +/- 0.052 mag Unknown (Errors are statistical only.) Further observations are planned." This message may be cited.