[AAVSO-HEN] GRB080810: 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:  8105
SUBJECT: GRB080810: optical observations
DATE:    08/08/16 02:20:14 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

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

We observed the optical afterglow of  GRB080810  (Page  et al., GCN  8080)
in R-band on Aug.10 between (UT) 23:17:05 - 23:48:32 with AZT-8 telescope of
CrAO. The afterglow is detect in a separate images in coordinates RA(J2000)
=  23 47 10.4, Dec(J2000) = +00 19 11.0 with uncertainty 0.5". The
coordinates are consistent with  reported early (Page et al. GCN 8080,
Rykoff GCN 8084, A. de Ugarte Postigo  et al. GCN 8090).
Based on  USNO-B1.0 star RA (J2000) = 23 47 11.12, Dec. (J2000) = +00 16
38.30, R=16.30 we estimated brightness of  the optical afterglow:

T0+,         Exposure,     R_mag,   err
(mid time)

0.4331 d  15x120 s     19.20  +/- 0.05