[vsnet-grb-info 8075] XRF 090702 : RTT150 optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9614
SUBJECT: XRF 090702 : RTT150 optical observations
DATE:    09/07/05 01:59:06 GMT
FROM:    Alexander Meshcheryakov at IKI  <mesch at iki.rssi.ru>

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

report:

We observed the field of XRF 090702 detected with IBIS/INTEGRAL (Paizis
et al., GC N 9603;) with Russian-Turkish 1.5-m telescope (RTT150,
Bakirlitepe, TUBITAK National Observatory, Turkey), starting at 02 Jul,
18:54 UT, i.e. 8.2h  after the burst.

We made 2x600s exposures in SDSS r filter. In the combined image we do
not detect any sources inside the XRT/SWIFT error circle (Sbarufatti &
Mangano, GCN 9604). Using SDSS catalog for photometric calibration, we
estimate 3-sigma upper limit for any optical counterpart as  m_r > 22.4.