[vsnet-grb-info 20128] GRB 171205A: Mondy optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  22224
SUBJECT: GRB 171205A: Mondy optical observations
DATE:    17/12/10 10:17:25 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at 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 171205A (D'Elia et al., GCN 22177)    with
AZT-33IK telescope of Sayan observatory (Mondy).  We took several images 
in R-filter under non-optimal weathe conditions on Dec. 08 and fair 
condiotns on Dec. 09.  The afterglow of GRB 171205A (Izzo et al. GCN 
22180; Emery et al. GCN 22181; Butler et al. GCN 22182; Mao et al. GCN 
22186; Choi et al. GCN 22188; Melandri et al. GCN 22189; Steeghs et al. 
GCN 22190; Cobb et al. GCN 22192; Volnova et al. GCN 22193; Guidorzi et 
al. GCN 22197; Schmidl et al. GCN 22198; Lipunov et al. GCN 22199; 
Ugarte Postigo et al. GCN 22204)  is  detected on Dec. 09. Preliminary 
photometry is following.

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

2017-12-08  21:18:28 3.59292  R      1200  n/d    n/d  18.5
2017-12-09  20:44:55 4.57936  R      3300  18.4   0.1  21.7

The photometry is based on several nearby USNO-B1.0 stars previously 
used in GCN 22193.