GCN Circular 10700

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

report:

The optical afterglow of GRB 100418A (Marshall et al., GCN 10612
Not found
 
 
, Filgas
et al., GCN 10617
Not found
 
 
) was observed with Russian-Turkish 1.5-m telescope
(RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey) in April
23/24 and April 27/28, 2010, in partially cloudy conditions. We obtained
one useful 900 sec image in Rc-band in April 24 and nine 900 sec images
in April 28. In spite of bright Moon in April 27/28 observations OT is
clearly detected in combined image.

In the Table below we give our Rc estimates of the OT brightness
relative to the nearby USNO-B1.0 star 1014-0271368 (R2Mag=17.32).

Date     UT  (T-T0),h    Rc      err
Apr.24 00:20 123.1       20.6  +/-0.10
Apr.28 00:50 220.0       21.25 +/-0.05

Preliminary Rc-light curve can be found at:
http://hea.iki.rssi.ru/grb/100418a/indexeng.html

OT is still brighter compared with its host galaxy (Malesani, GCN10621
Not found
 
 
)
and further spectroscopic and photometric observations of this event are
very important to check possible SN contribution in the OT flux.


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