TITLE:   GCN CIRCULAR
NUMBER:  23620
SUBJECT: GRB 190106A : TSHAO optical observations
DATE:    19/01/06 15:27:05 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

I. Reva (FAPHI), A. Pozanenko (IKI),
  A. Kusakin (FAPHI), S. Belkin (IKI), A. Volnova (IKI),  E. Mazaeva 
(IKI), M. Krugov (FAPHI) report on behalf of larger GRB follow-up 
collaboration:

We observed the optical transient (Yurkov et al., GCN 23614; Sonbas et 
al., GCN 23615; Lipunov et al., GCN 23616; Itoh et al., GCN 23617) of 
GRB 190106A (Sonbas et al., GCN 23615) with Zeiss-1000 1-m telescope of 
Tien Shan Astronomical Observatory starting on Jan. 6 (UT) 13:45:42. 
Preliminary photometry of the object in the beginnig of observations is 
R= 16.23 +/- 0.05, and the optical transient is faded as R= 17/5 +/- 0.1 
at (UT) 14:24:04. (The photometry is based on nearby USNO-B1.0 stars). 
Observations are continuing in R and B - filters.