GCN Circular 22223

A. Volnova (IKI), A. Moskvitin (SAO RAS), A. Pozanenko (IKI) report on 
behalf of of larger GRB follow-up collaboration:

We observed the field of GRB 171205A (D'Elia et al., GCN 22177
Not found
 
 
)   with 
Zeiss-1000  telescope of SAO-RAS Observatory starting on Dec. 09 (UT) 
01:07:09. We took several images in R-filter.  The afterglow of GRB 
171205A (Izzo et al. GCN 22180
Not found
 
 
; Emery et al. GCN 22181
Not found
 
 
; Butler et al. 
GCN 22182
Not found
 
 
; Mao et al. GCN 22186
Not found
 
 
; Choi et al. GCN 22188
Not found
 
 
; Melandri et al. 
GCN 22189
Not found
 
 
; Steeghs et al. GCN 22190
Not found
 
 
; Cobb et al. GCN 22192
Not found
 
 
; Volnova et 
al. GCN 22193
Not found
 
 
; Guidorzi et al. GCN 22197
Not found
 
 
; Schmidl et al. GCN 22198
Not found
 
 
; 
Lipunov et al. GCN 22199
Not found
 
 
;  Ugarte Postigo et al. GCN 22204
Not found
 
 
)  is clearly 
detected. Preliminary photometry is following.

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

2017-12-09  01:07:09 3.79078  R      22*300  18.60  0.04  22.5

The photometry is based on several nearby USNO-B1.0 stars previously 
used in GCN 22193
Not found
 
 
.