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GCN Circular 823

GRB000926 - Optical observations
2000-09-30T21:14:00Z (24 years ago)
Christian Veillet at CFHT <>
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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

One 600s exposure with moderate seeing (image quality 0.8")
has been obtained and a preliminary reduction using the reference 
star of Halpern et al. (GCN #806) with R=17.1 gives the following 
measurement for GRB000926:

Sept. 30.3075  R = 22.19 +/- 0.06

Added to the R-band data points used in the analysis by Hjorth et al.
(GCN #814), to the previous CFHT observation and to the last data
by Fynbo et al. (GCN #820), this new point confirms the change in decay
rate announced in GCN #820.
The decay value is now 2.44 +/- 0.07, using data past Sept 29.2, while
the decay is 1.67 +/- 0.04 with data prior to Sept 29.2.

A graph of the light curve in R with the linear fits can be found at

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
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