TITLE:   GCN CIRCULAR
NUMBER:  19919
SUBJECT: GRB 160910A: Mondy optical observations
DATE:    16/09/13 10:30:41 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed the field of the GRB 160910A (Veres  et al., GCN 19901; Racusin 
et al., GCN 19902) with  AZT-33IK telescope of Sayan observatory (Mondy) 
starting on Sep., 12 (UT) 14:02:46. We obtained several images in R-filter. 
We  clearly detected optical afterglow (Ugarte Postigo et al., GCN 19907; 
Malesani et al., GCN  19908; Lipunov et al., GCN  19914). Preliminary 
photometry  of the afterglow is following

Date        UT start   t-T0      Filter Exp.   OT        UpLim (3 sigma)
                        (mid, days)       (s)

2016-09-12  14:02:46   1.87506    R      32*60 19.92+/-0.05  22.2


Photometry is based on nearby SDSS-DR9 stars
SDSS-DR9_id    R(Lupton transformation)
J144549.10+390403.4    16.86
J144552.78+390234.9    17.32
J144538.58+390535.0    18.34
J144541.35+390128.0    17.15