TITLE: GCN GRB OBSERVATION REPORT NUMBER: 814 SUBJECT: GRB 000926: Lightcurve Update and Predictions DATE: 00/09/29 13:00:56 GMT FROM: Brian Lindgren Jensen at U.of Copenhagen J. Hjorth, B. L. Jensen, and H. Pedersen (U. of Copenhagen), J. U. P. Fynbo and P. Moller (ESO), J. Gorosabel (DSRI, Copenhagen) report on behalf of a larger European GRB collaboration: Further to GCN #809, we report an additional NOT R-band data point obtained on Sept. 28.9595 UT: R=20.889+-0.035. We note that if we exclude the preliminary data point of Halpern et al. (GCN #806) and include the data point of Price et al. (GCN #811) the lightcurve is consistent with a pure power law decay with a decay index of -1.66 +- 0.02. Further monitoring of the optical afterglow is needed to distinguish a pure power law and a broken power law decay. A finding chart, a lightcurve and predictions for the coming days are posted at http://www.astro.ku.dk/~brian_j/grb/grb000926/ ."