[vsnet-grb-info 20307] GRB 180205A: AbAO optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22403
SUBJECT: GRB 180205A: AbAO optical observations
DATE:    18/02/08 07:52:59 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI),  A. Pozanenko (IKI),  A. Volnova  (IKI), R. Inasaridze 
(AbAO),  V. Ayvazian  (AbAO),  O. Kvaratskhelia (AbAO), G. Inasaridze 
(AbAO),  I. Molotov (KIAM), report on behalf of larger GRB follow-up 
collaboration:

We observed the field of GRB 180205A (Evans  et al., GCN 22381) with 
AS-32 (0.7m) telescope of Abastumani Observatory starting on Feb., 06 
(UT)  23:53:51. We obtained several unfiltered images  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; Tanvir et al. 
GCN 22384; Volnova et al. GCN 22387; Falcon et al. GCN 22380; Xin et al. 
22392; Zhu et al. 22395; Emery et al. 22396; Im et al., GCN 22397)  is 
clearly detected in a stacked image. Preliminary photometry is following.

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


2018-02-06  17:09:23  1.54515   CR     24*60 20.32   0.10  21.2

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