[vsnet-grb-info 4542] GRB 070419: P60 Confirmation of Optical
Afterglow
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Apr 19 20:17:01 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6306
SUBJECT: GRB 070419: P60 Confirmation of Optical Afterglow
DATE: 07/04/19 11:16:54 GMT
FROM: S. Bradley Cenko at Caltech <cenko at srl.caltech.edu>
S. B. Cenko (Caltech) and D. B. Fox (Penn State) report on behalf of a
larger collaboration:
We have imaged the field of GRB070419 (Stamatikos et al., GCN 6302) with
the automated Palomar 60-inch telescope. The candidate identified by
Chornock et al. (GCN 5304) is visible in our images and variable; we
therefore confirm it is the optical afterglow of GRB070419. Specifically,
we measure the following R-band magnitudes:
Mean Date Time Since Burst Magnitude
--------------------------------------------------------------------------
10:05:18 5.87 min 19.7
10:10:31 11.08 min 18.7
The above magnitudes were calculated assuming a magnitude of R=15.22
for the the USNO-B reference star located at 12:10:57.57, +39:55:40.2.
Further observations are planned.
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