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GCN Circular 19929

Subject
GRB 160917A: Mondy optical observations
Date
2016-09-17T21:11:04Z (8 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Volnova (IKI),  A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva 
(IKI), I. Korobtsev (ISTP)  report on behalf of larger GRB follow-up 
collaboration:

We observed the field of the GRB 160917A (Racusin et al. GCN 19926) with 
  AZT-33IK telescope of Sayan observatory (Mondy) starting on Sep., 17 
(UT) 14:30:30. We obtained several images in R-filter. We detected the 
optical source within enhanced XRT error circle (Evans et al., GCN 
19927) in coordinates (J2000) 19 42 39.81 +46 24 12.1 with 
uncertainities of 0.4 arcsec in both coordinates. Preliminary photometry 
  of the afterglow is following

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

2016-09-17  14:30:30   0.14601    R     120*30 20.60 +/- 0.20  22.9

Photometry is based on nearby USNO-B1.0 stars
ID             RA           Dec        R2

1 1363-0324591 19:42:38.95 +46:23:53.8 16.62
2 1364-0326339 19:42:40.68 +46:24:37.0 17.40
3 1363-0324630 19:42:42.78 +46:23:28.7 17.05

We suggest the source as optical afterglow of GRB 160917A.

The finding chart can be found at 
http://grb.rssi.ru/GRB160917A/160917A_Mondy_fc.png
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