TITLE:   GCN CIRCULAR
NUMBER:  18575
SUBJECT: GRB 151027A: continued Mondy optical observations
DATE:    15/11/10 19:10:04 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI),  I. Korobtsev 
(ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up 
collaboration:

We continue observations (GCN 18559) of the Swift GRB 151027A  (Maselli 
  et al., GCN 18478) with AZT-33IK telescope of Sayan observatory 
(Mondy).   We obtained images in R-filter  on Nov., 4, 5, 7-9. In a 
combined image obtained on Nov. 7 we clearly detect a galaxy which 
coincide with the object 1513-0237216 of USNO-B1.0 catalog.  The object 
was also mentioned in GCN 18510 (Dichiara et al.) and GCN 18559 (Mazaeva 
et al.)

The finding chart can be found in 
http://grb.rssi.ru/GRB151027A/GRB151027A_20151107_AZT33IK_host.png

The afterglow (Maselli et al., GCN 18478; Zheng and  Filippenko, GCN 
18479) is not well detected.  The afterglow might overlap with 
North-East wing of the galaxy. The galaxy could be suggested as a host 
galaxy of GRB 151027A.

Preliminary photometry of the galaxy is R= 20.60+/-0.04 at November, 7.

The photometry is based on nearby USNO-B1.0 stars referenced in GCN 18559.