TITLE: GCN GRB OBSERVATION REPORT NUMBER: 826 SUBJECT: GRB000926 - Optical observations DATE: 00/10/01 19:34:03 GMT FROM: Christian Veillet at CFHT GRB000926 - Optical observations The optical counterpart of GRB000926 has been observed using the CFH12K CCD mosaic camera at the prime focus of the 3.6-m CFH Telescope for the third night. One 600s exposure has been obtained with an excellent seeing (0.5"). Using the new R magnitude of 17.06 by Halpern et al. (GCN #824) for the reference star, the three R magnitudes of the GRB for our observations are: Sept. 29.3075 R = 21.19 +/- 0.05 Sept. 30.3075 R = 22.15 +/- 0.06 Oct. 01.2593 R = 22.57 +/- 0.08 The last observation by Fynbo et al. (GCN #825) and this new CFHT data point sugest that the GRB is no longer on the decay reported by Fynbo et al. (GCN #820), Veillet (GCN #823) and Halpern et al. (GCN #824). We could see a flare out as suggested by Dar in a private communication (see also astro-ph/0008474), though more observations would definitely be welcome at this stage... A new graph of the light curve in R can be found at http://www.cfht.hawaii.edu/~veillet/grb.html D. Kocevski, D. Donovan and G. Luppino are acknowledged for their help in this observation. This message may be cited. -- ************************************************************ Dr. Christian Veillet, CFHT Senior Resident Astronomer Phone: (808) 885-3161 http://www.cfht.hawaii.edu/~veillet/ ************************************************************