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GCN Circular 6617

GRB 070704: RTT150 optical observations
2007-07-11T10:21:38Z (16 years ago)
Alexander Mescheryakov at IKI RAN <>
A. Meshcheryakov, R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), 
I. Khamitov, 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

This message may be cited.

[GCN OPS NOTE(12jul07): Per author's request, IK was added to the author list,
and the extra period after 'filter' in the 4th line was removed.]
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