[vsnet-grb-info 6490] GRB 080810: RTT150 optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  8102
SUBJECT: GRB 080810: RTT150 optical observations
DATE:    08/08/13 13:46:42 GMT
FROM:    Irek Khamitov at TUG  <irekk at tug.tug.tubitak.gov.tr>

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

report:

We observed the GRB 080810 afterglow (Page et al. GCN Circ. 8080)
with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK
National Observatory, Turkey).

The series of several exposures in V,Rc,Ic bands were made
by using Andor CCD starting at 13 Aug 2008, 00:24 UT, i.e. ~ 59.23 hours 
after the burst.

Using USNO-B1.0 stars we estimate an Rc magnitude of 21.60+/-0.05
(~59.85 hours after the burst).

This measurement deviates from the power law decay with index -0.9
(Galeev et al., GCN8098,Guidorzi et al, GCN8099), that indicates steeper 
fading of OT after 48h.

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