[vsnet-grb-info 326] GRB020813: optical afterglow

[GCN Circulars <gcncirc@lheawww.gsfc.nasa.gov>]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  1473
SUBJECT: GRB020813: optical afterglow
DATE:    02/08/13 07:57:18 GMT
FROM:    Weidong Li at UC Berkeley KAIT/LOSS  <weidong@astron.berkeley.edu>

W. D. Li, A. V. Filippenko, and R. Chornock (UC Berkeley) report on
behalf of the Lick Observatory and Tenagra Observatory Supernova
Search (LOTOSS):

"We have observed a rectangle region of about 10' x 7' around the
position of GRB020813 (HETE Trigger #2262) with the 0.8-m Katzman
Automatic Imaging Telescope (KAIT) with 21 unfiltered exposures (30s,
120s and 300s) beginning on Aug 13 04:27 UT and lasted until 7:33 UT.
Comparison with DSS II images identified the apparent new object reported 
by Fox, Blake, & Price (GCN #1470), with a precise position measured
at RA = 19:46:41.89, Decl. = -19:36:04.5 (J2000).  The object is also
apparently fading with the following unfiltered magnitudes

Aug 13 4.4625 UT, mag 17.75
Aug 13 4.5200 UT, mag 17.77
Aug 13 4.7786 UT, mag 17.82
Aug 13 5.9683 UT, mag 18.10
Aug 13 7.5550 UT, mag 18.42
   
We therefore strongly suggest that this is the afterglow of GRB020813.
This photometry sequence is consistent with a power law of index
-0.6.  A finding chart of the object can be found at 
http://astron.berkeley.edu/~weidong/grb020813.gif.";

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