TITLE:   GCN CIRCULAR
NUMBER:  19954
SUBJECT: GRB 160927A: RTT150 optical afterglow candidate
DATE:    16/09/27 21:01:06 GMT
FROM:    Rodion Burenin at IKI, Moscow  <rodion@hea.iki.rssi.ru>

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

report:

We observed field of Swift short hard GRB 160927A (Gibson et al., GCN
19952) with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe,
TUBITAK National Observatory, Turkey) using TFOSC. We obtained four
600s exposures in SDSS-r filter at high airmass and very poor seeing
(2.5 arcsec) starting at 18:59:24 UT, i.e. approximately 55 min after
the burst. 

At the edge of improved XRT localization (Evans et al., GCN 19953) we
find faint optical source, which is not present in SDSS image, at the
position: 

RA,Dec: 17:04:58.21 +17:19:55.5  (J2000)

For this source we estimate SDSS-r mag =~ 22.3. The finding chart can
be found at: 

http://dlc.rsdc.rssi.ru/~rodion/grb/160927a/r.jpg