TITLE: GCN CIRCULAR NUMBER: 22411 SUBJECT: GRB 180205A: BAO optical observations DATE: 18/02/11 10:53:10 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (IKI), A. Novichonok (KIAM), A. Pozanenko (IKI), S. Kotov (SAO RAS), T. Movsesyan (BAO), 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 Schmidt-1m telescope of Byurakan Astrophysical Observatory (BAO). We took several images in r (Sloan)-filter starting on Feb. 08 (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. 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) is clearly detected in a stacked image. Preliminary photometry is following. Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2018-02-08 18:00:00 3.59550 r 12*300 21.3 0.2 21.9 The photometry is based on several nearby SDSS DR9 stars SDSS_id r J082719.98+113324.0 16.357 0.005 J082717.26+113400.0 16.292 0.005 J082715.06+113230.6 15.744 0.004