TITLE:   GCN CIRCULAR
NUMBER:  22387
SUBJECT: GRB 180205A: Mondy optical observations
DATE:    18/02/05 19:19:37 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed the field of GRB 180205A (Evans  et al., GCN 22381)    with
AZT-33IK telescope of Sayan observatory (Mondy).  We took several images 
in R-filter starting on Feb. 05 (UT) 12:54:29.  The afterglow of GRB 
180205A (Evans  et al., GCN 22381; Zheng et al., GCN 22382; Bolmer et 
al., GCN 22383)  is  clearly detected in a stacked image. Preliminary 
photometry is following.

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


2018-02-05  12:54:29  0.372*    R      30*120 19.47   0.07  21.8

* The time after XRT observation start  at (UT) 04:28:23.69.

The photometry is based on several nearby SDSS DR9 stars

SDSS_id                 R_Lupton
J082719.98+113324.0	16.206	0.013
J082717.26+113400.0	16.092	0.013
J082715.06+113230.6	15.553	0.013