[vsnet-grb-info 2343] GRB 051021A: RTT150 optical observations

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4180
SUBJECT: GRB 051021A: RTT150 optical observations
DATE:    05/10/30 06:41:30 GMT
FROM:    Rodion Burenin at IKI, Moscow  <rodion at hea.iki.rssi.ru>

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

report:

The optical transient associated with GRB 051021A (Yoshida et al., GCN
4116; Fox et al., GCN 4120) was observed with Russian-Turkish 1.5-m
telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory, Turkey) in
BVR filter set, starting at Oct. 21, 18:15 UT, 4.88 hours after the
burst.

Compared to USNOB, the magnitudes are about:

t-t0,h
 5.34    R=21.1
 9.95    R=21.8
 5.70    V=22.2
10.18    V=22.6

In B the object was detected only marginally.

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