TITLE: GCN GRB OBSERVATION REPORT NUMBER: 827 SUBJECT: GRB000926 - Optical observations DATE: 00/10/02 22:09:20 GMT FROM: Christian Veillet at CFHT Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit 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 fourth night. One 600s exposure has been obtained with a decent seeing (0.7"). Using the new R magnitude of 17.06 by Halpern et al. (GCN #824) for the reference star, the R magnitude of the GRB is found as: Oct. 02.2626 R = 22.82 +/- 0.08 The last two days of data from Halpern et al. (GCN #284), Fynbo et al. (GCN #825), and the previous CFHT measurement (GCN #826) suggest a new decay phase with a decay rate of 1.47 +/- 0.10 . 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/ ************************************************************