[vsnet-grb-info 1921] GRB050803: CrAO optical observations, possible OT candidate

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3760
SUBJECT: GRB050803: CrAO optical observations, possible OT candidate
DATE:    05/08/04 17:27:05 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Pavlenko, Yu. Efimov, A. Shlyapnikov, A. Baklanov, V. Rumyantsev  (CrAO),
A.Pozanenko (IKI), M. Ibrahimov (MAO) on behalf of larger GRB follow up
collaboration report:

On August 3, 21:20 (UT) we observed XRT error box (Racusin et al., GCN 3752)
of   GRB050803 (Band et al., GCN 3748) with 2.6m Shain telescope (CrAO).
Within XRT error box we detect the object noted in GCN 3753 (Berger et al.).
The magnitude of the object is  R = 20.72 +/- 0.22  at  mid time August 3,
(UT) 21:50 and was calibrated against of USNO B1.0 star 0957-0591541
(R=19.31). Taking into account the I ~ 22 mag at August 4.234 (UT) repored
by Berger et al. (GCN 3753)one can suggest that the object is fading and can
be considered as possible OT candidate.

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