[vsnet-grb-info 20334] GRB 180205A: Mondy optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22430
SUBJECT: GRB 180205A: Mondy optical observations
DATE:    18/02/21 16:55:22 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

E. Mazaeva (IKI), A. Volnova (IKI),  A. Pozanenko (IKI),  E. Klunko 
(ISTP)  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 obtained several 
images in R and B-filter on Feb. 05  - Feb. 19.  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. GCN 22392; Zhu et al. GCN 22395; Emery et al. 
GCN  22396; Im et al., GCN 22397; Oksanen et al. 22401; Mazaeva et al., 
GCN 22403; Volnova et al., GCN 22411;  Cunningham et al., GCN 22414)  is 
  detected in  stacked images. Preliminary photometry is following.

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


2018-02-05  15:21:12  0.49438    R      30*120 19.32  0.04  21.9
2018-02-05  16:23:51  0.53094    B      20*120 20.70  0.17  21.3
2018-02-05  20:03:02  0.69011    R      60*60  19.60  0.08  21.7
2018-02-06  16:07:42  1.50850    R      30*120 20.25  0.07  22.0
2018-02-14  15:48:28  9.50557    R      45*120 22.46  0.13  23.9
2018-02-18  13:23:22  13.40481   R      45*120 n/d    n/d   23.0
2018-02-19  14:37:56  14.45658   R      45*120 23.6   0.3   23.6

The photometry is based on 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