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GCN Circular 6617

Subject

GRB 070704: RTT150 optical observations

Date

2007-07-11T10:21:38Z (17 years ago)

From

Alexander Mescheryakov at IKI RAN <gardel@hea.iki.rssi.ru>

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 6594Not found
 
 
) 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 6598Not found
 
 
) 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.]