[AAVSO-HEN] GRB080605: optical observations

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The following is a GCN Circular circulated via the AAVSO network.
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TITLE:   GCN CIRCULAR
NUMBER:  7833
SUBJECT: GRB080605: optical observations
DATE:    08/06/06 04:22:14 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

V. Rumyantsev (CrAO),  A. Pozanenko (IKI) report on behalf of larger GRB 
follow-up collaboration:

We observed the optical afterglow (Kann,  et al., GCN 7829; Holland et al., 
GCN 7830; Gomboc et al., GCN 7831) of  Swift GRB 080605 (Sbarufatti  et al., 
GCN 7828) in R and I bands on June 05  Zeiss-1000 (Simeiz) telescope of CrAO 
observatory under not optimal weather conditions.  Based on  USNO-B1.0 star 
RA (J2000) = 17 28 29.92, Dec.
(J2000) = +04 00 36.5, R2=15.90 we estimated brightness of  the optical 
afterglow in first frames:

UT,       Exposure,   R_mag,
(start time)

2008-06-05T23:55:58    120 s     17.9
2008-06-06T00:00:34    120 s     18.4

During observations the afterglow is clearly faded.
Coordinates of the afterglow with uncertainties of 0.3":

RA(2000):  17 28 30.01
Dec(2000): +04 00 56.4

A finding chart can be found at 
http://grb.rssi.ru/GRB080605/grb080605_080605_z1000.gif
The message may be cited.