GCN Circular 623
Subject
GRB000301C - R magnitude lower limit
Date
2000-04-05T01:33:30Z (24 years ago)
From
Christian Veillet at CFHT <veillet@cfht.hawaii.edu>
The candidate for the optical transient (OT) associated with the gamma
ray burst GRB000301C has been observed using the CFH12K CCD mosaic
camera at the prime focus of the 3.6-m CFH Telescope in the course of
the French GRB follow-up program at CFHT (M. Boer, CESR, C. Veillet,
CFHT).
Three 12 mn exposures with moderate seeing (image quality around 0.9") have
been coadded.
There is nothing visible at the location of the OT. The nearby galaxy
(thought to be the host for some time before the HST observations) has a
magnitude of R= 24.5 +-0.1, confirming the previous determinations (GCN592
- GCN598).
The faintest objects detected in the neighborhood are at around R=26.
We can infer the following lower limit:
R > 26.0 on 2000 April 4.6
It is compatible with the alpha = -2.7 power law decay given in GCN611, and
not with alpha = -2.1 given earlier, which would lead to R~25.6 at the
same epoch.
Further imaging is planned if the seeing gets better.
Jean-Charles Cuillandre is acknowledged for his 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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