TITLE: GCN GRB OBSERVATION REPORT NUMBER: 806 SUBJECT: GRB 000926, Optical Observation DATE: 00/09/28 07:15:17 GMT FROM: Jules Halpern at Columbia U. J. P. Halpern, N. Mirabal (Columbia U.), D. Turnshek & J. Busche (U. Pittsburgh) report on behalf of the MDM Observatory GRB follow-up team: "We observed the optical candidate for GRB 000926 (Gorosabel et al. GCN #803; Dall et al. GCN #804) in R and B on Sep. 28.177 UT using the MDM 2.4m. We measure the position of the optical candidate to be (J2000) RA 17:04:09.749, Dec +51:47:09.97 in the Guide Star Catalog system, relative to eight stars having an rms dispersion of 0".15. A preliminary magnitude for the optical candidate is measured as R = 19.89 +/- 0.02, referenced to a USNO-A2.0 star at (J2000) RA 17:04:01.206, Dec +51:46:19.88 which is listed as having R = 17.1. Since this measurement was made from an unprocessed image, it is subject to additional systematic error, and should not be used in serious analyses. The decay rate is therefore still unknown."