[vsnet-grb-info 18309] GRB 160801A: TSHAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19757
SUBJECT: GRB 160801A: TSHAO optical observations
DATE:    16/08/02 22:45:50 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), A. Kusakin (Fesenkov Astrophysical Institute), I. Reva 
(Fesenkov Astrophysical Institute),  A. Pozanenko (IKI) report on behalf of 
larger GRB follow-up collaboration:

We observed the field of GRB 160801A  (D'Elia et al., GCN 19744 ) with 
Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory. We 
obtained several images in R filter starting on August 01 (UT) 15:10:55. We 
do not  detect any optical source within enhanced XRT error position (Goad 
et al., GCN 19746). Preliminary photometry of a combined image is following

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

2016-08-01 15:10:55  0.28422  R   60*120 n/d  n/d  22.4

Photometry is based on nearby SDSS DR9 stars
SDSS-DR9_id                   R(Lupton)
J141100.70+132838.3    17.993
J141057.03+132833.7    17.684
J141054.86+132751.0    18.338
J141055.05+132937.2    18.545
J141059.52+133105.4    19.518
J141102.35+133019.9    18.384
J141102.64+133004.5    18.354

Our preliminary  photometry of the SDSS object (Cano et al.,  GCN 19753) 
which is also mentioned by Moskvitin et al. (GCN 19755)  is R=21.1+/-0.1 and 
based on the same nearby SDSS stars.

A finding chart can be found  in 
http://grb.rssi.ru/GRB160801A/GRB160801A_TSHAO_160801_2.png