GCN Circular 11254
Subject
GRB 100906A: RTT150 optical observations
Date
2010-09-07T18:30:39Z (14 years ago)
From
Rodion Burenin at IKI, Moscow <rodion@hea.iki.rssi.ru>
A. Tkachenko (IKI), I. Khamitov (TUG),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
I. Bikmaev, N. Sakhibullin (KSU/AST),
Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
The optical counterpart of GRB 100906A (GCN 11227) was observed with
Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National
Observatory, Turkey), starting at Sep 06, 19:28 UT, i.e. ~5.64 hours after
the burst, using TFOSC.
Three series of BRI frames were made under moderate weather conditions. The
afterglow is clearly detected in all images.
Assuming the star at RA = 01:54:46.82, Dec. = +55:37:55.3 to have USNOB1.0
R2MAG = 15.70, we estimated the following magnitudes for the OT on combined
images of every set:
t-t0 band mag err
6.048 h R 18.80 0.02
9.610 h R 19.08 0.02
13.554 h R 19.69 0.04
The color of the afterglow changes from (B-R)=1.21 to (B-R)=1.31 at the
beniginning and at the end of our observations.