[vsnet-grb-info 7031] GRB081203A: optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8615
SUBJECT: GRB081203A: optical observation
DATE:    08/12/04 18:32:07 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

M. Andreev, A. Sergeev (Terskol Branch of Institute of Astronomy),  Ju. 
Babina  (CrAO), A. Pozanenko (IKI) on behalf of larger GRB follow up 
collaboration report:

We observed   the field of GRB 081203  (Parsons  et al, GCN 8595) with the 
Z-600 telescope of Mt. Terskol observatory  between (UT) Dec.03 14:29-14:38 
(unfiltered exposures of 15 s), Dec.03 14:50 - Dec.04 01:45 (R-band 
exposures of 60  s), and  starting (UT) Dec.04 15:27.

In mid time Dec.04 (UT) 00:50 the afterglow is detected on combined images 
and R=19.5 +/-0.2.  In mid time Dec. 04  (UT) 15:32 we do not detect the 
afterglow up to R=20.6 (3 sigma). The photometry is still preliminary and 
basen on star of SDSS J153155.64+632959.4 (=USNO-B1.0 1534-0214259), 
assuming R=14.69.