GCN Circular 1003
Subject
GRB010222 - Optical observation
Event
Date
2001-03-03T00:39:04Z (25 years ago)
From
Christian Veillet at CFHT <veillet@cfht.hawaii.edu>
The optical counterpart of GRB010222 has been observed using the
CFHT Multi Object Spectrograph in imaging mode at the Cassegrain
focus of the 3.6-m CFH Telescope on the night of March 1 to 2.
Two 10 mn images were obtained with a seeing of about 0.8".
Photometric reduction made as outlined on GCN #1000 leads to:
Mar. 2.641 R = 23.10 +/- 0.10
The index of the power law decay fitting the R light curve data
since 0.6 days after the burst (including the revised and new
measurements by Holland et al. in GCN #1002) is 1.25 +/- 0.03,
the same as our previous determination (Veillet, GCN #1000) and
not significantly different from the GCN #1002 value.
While a few objects are now seen in a radius of 4", the OT is
still a point like object.
More information (with the new images of the OT) can be found at
http://www.cfht.hawaii.edu/~veillet/grb.html
M. Pakull, L. Mirioni, and J. McDonald are acknowledged for their
help in this observation.
This message may be cited.
--
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Dr. Christian Veillet, CFHT Senior Resident Astronomer
Phone: (808) 885-3161 http://www.cfht.hawaii.edu/~veillet/
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