[vsnet-grb-info 6823] GRB081025: RTT150 optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8418
SUBJECT: GRB081025: RTT150 optical observations
DATE:    08/10/27 09:09:48 GMT
FROM:    Rodion Burenin at IKI, Moscow  <rodion at hea.iki.rssi.ru>

I. Khamitov (TUG), N. Aleksandrovich,
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
I. Bikmaev, N. Sakhibullin (KSU/AST),
Z. Eker (TUG), U. Kiziloglu (METU),  E. Gogus (Sabanci Uni.)

report:

We observed the field of the Swift-BATSS GRB 081025 (Copete et al., GCN8409)
with Russian-Turkish 1.5-m  telescope (RTT150, Bakirlitepe, TUBITAK National
Observatory, Turkey), starting at 25 Oct, 19:51 UT, i.e. approximately 11.5 hours
after the burst, using Andor CCD.

We made 3x300s exposures in sdss-g filter, at high zenith distance (~70 degree)
and with bad seeing ~ 3". We do not detect any new source inside the XRT error circle
(Mao et al., GCN8411) as compared to DSS plates. Using photometric solution from
previous nights we estimated the limiting magnitude of combined image as m_g ~ 22.