[vsnet-grb-info 6564] GRB 080903: Optical afterglow candidate

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8172
SUBJECT: GRB 080903: Optical afterglow candidate
DATE:    08/09/03 03:58:28 GMT
FROM:    Antonio Deugarte at IAA-CSIC  <deugarte at iaa.es>

A. de Ugarte Postigo (ESO, Chile), A.J. Castro-Tirado,
V. Casanova, J. Gorosabel, M. Jelinek, M. Guerrero
(IAA-CSIC, Granada) report on behalf of a larger collaboration:

We have observed the field of GRB 080903 (Grupe et al., GCN 8169)
using the 1.5m OSN telescope at Sierra Nevada Observatory (Granada)
in V, R and I bands begining at 02:30 UT (78 min after the burst).
We detect a source of I~21.0 on the edge of the XRT error box at
the following coordinates (J2000 +/- 0.5"):

R.A.: 05:47:10.08
Dec.: +51:15:50.9

Further observations are ongoing from OSN and NOT to check the
colour and variability of this source.