[vsnet-grb-info 20815] GRB 180705A: TSHAO optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22913
SUBJECT: GRB 180705A: TSHAO optical upper limit
DATE:    18/07/06 11:29:42 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), A. Pozanenko (IKI),  A. Kusakin (FAPHI), I. Reva 
(FAPHI),  A. Volnova (IKI), M. Krugov (FAPHI) report on behalf of larger 
GRB follow-up collaboration:

We observed the field of GRB 180705A  (Stamatikos et al., GCN 22902) 
with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory 
starting on July 05 (UT) 16:13:52. We obtained several images in 
R-filter.  Within enhanced XRT Swift-XRT position (Goad et al., GCN 
22906)  we do not detect any object.  Preliminary photometry of the 
field is following.

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

2018-07-05  16:13:52 0.04895  R      25*120  n/d  n/d    21.3

The photometry is based on several nearby SDSS-DR12 stars.

Ref.stars
SDSS-DR12_id           R(Lupton)
J141030.67-113927.0    17.460
J141015.17-113809.7    17.680