[vsnet-grb-info 1995] GRB 050820: P60 Temporal Decay Index
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Sat Aug 20 19:39:06 JST 2005
TITLE: GCN GRB OBSERVATION REPORT
NUMBER: 3834
SUBJECT: GRB 050820: P60 Temporal Decay Index
DATE: 05/08/20 10:37:09 GMT
FROM: S. Bradley Cenko at Caltech <cenko at srl.caltech.edu>
S. Bradley Cenko (Caltech) and Derek B. Fox (Penn State) report on behalf
of a larger collaboration:
We have continued to image the afterglow (GCN 3829) of GRB 050820 (GCN
3830) with the automated Palomar 60-inch telescope. Using the USNO-B1
star located at RA=22:29:39.88, Dec=+19:32:47.5 (USNO-B1 1095-0581263, R =
15.21) as a reference, we find, after rising to a peak magnitude of R =
14.7 approximately 7 minutes after the burst, the afterglow has exhibited
a relatively smooth power-law decay with index alpha = -0.9. In an image
taken ~ 93 minutes after the burst, the afterglow has a magnitude of R ~
17.4.
Further observations are planned.
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