[vsnet-grb-info 4889] GRB 070704: RTT150 optical observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Jul 11 19:21:53 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6617
SUBJECT: GRB 070704: RTT150 optical observations
DATE: 07/07/11 10:21:38 GMT
FROM: Alexander Mescheryakov at IKI RAN <gardel at hea.iki.rssi.ru>
A. Meshcheryakov, R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
Z. Tunca (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.),
I. Bikmaev, and N. Sakhibullin (KSU/AST) report:
We observed the field of GRB 070704 (Sakamoto et al., GCN 6594) with
Russian-Turkish 1.5-m telescope (RTT150, Bakyrlytepe,TUBITAK National
Observatory, Turkey). The observations consisted of a series 30-second
exposures in g',r',i' filters. , until ~1h after the burst time we
continue only r'-filter exposures. The first exposure in g' started at
20:15:13.9UT, i.e.556 s after the BAT trigger. The observations were
finished ~1.5 hour after the burst time.
In 30-second images as well as in combined images we do not detect any
new object at the revised XRT position (Godet & Sakamoto, GCN 6598) down
to following limiting magnitudes:
Filter T_start(sec after trigger) Exp(s) Lim
----------------------------------------------------------------------------
g' 556 30 20.1 first
240 21.2 combined
r' 641 30 20.1 first
1720 22.3 combined
i' 721 30 20.3 first
180 21.3 combined
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