TITLE:   GCN CIRCULAR
NUMBER:  16482
SUBJECT: GRB 140629A: RTT150 optical observations
DATE:    14/06/29 20:02:26 GMT
FROM:    Rodion Burenin at IKI, Moscow  <rodion@hea.iki.rssi.ru>

I. Bikmaev (KFU/AST), I. Khamitov (TUG),
E. Irtuganov, N. Sakhibullin (KFU/AST),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
H. Kirbiyik (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)

report:

The field of the optical afterglow of GRB 140629A (Lien et al., GCN
16477, Yurkov et al., GCN 16478) was observed with Russian-Turkish
1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory,
Turkey) using the TFOSC instrument.

We obtained series of BVRcIc exposures. Start time is June 29, 18:33
UT. The optical transient is clearly detected in each images at
RA,DEC = 16:35:54.44 +41 52 36.7 +/- 0.1 arcsec (J2000).

Using the star at RA,DEC = 16:35:59.9 +41:51:10 (J2000) with USNO-B1
magnitude R1_mag = 16.49 as a reference we estimated the Rc-magnitude
of the afterglow:

Filter exptime   T-T0,   Mag. +/- Mag.err
        (sec)   (hour)
Rc       60      4.267   18.00 +/- 0.05

Further OT observations are ongoing at RTT-150.