TITLE:   GCN CIRCULAR
NUMBER:  23741
SUBJECT: GRB 190114C: CHILESCOPE optical observations
DATE:    19/01/16 16:09:52 GMT
FROM:    Elena Mazaeva at IKI, Moscow  <30.v@mail.ru>

E. Mazaeva (IKI), A. Pozanenko (IKI), A. Volnova (IKI), S. Belkin (IKI), M. Krugov (FAPHI) report on behalf of IKI-GRB-FuN:

We observed the field of GRB 190114C (Gropp et al., GCN 23688) with RC-1000 telescope of CHILESCOPE observatory. Observations started on Jan. 16 (UT) 01:34:52 in r'-filter. We detected optical afterglow (Tyurina et al., GCN 23690; de Ugarte Postigo et al., GCN 23692; Lipunov et al. GCN 23693; Selsing et al. GCN 23695; Izzo et al. GCN 23699; 
Bolmer et al. GCN 23702; Castro-Tirado et al. GCN 23708; Kann et al. GCN 23710; Im  et al. GCN 23717; Siegel  et al. GCN  23725; Mazaeva et al., GCN  23727; D'Avanzo et al., GCN 23729; Kim et al., GCNs 23732,23734).
Preliminary photometry of a stacked image is following.

Date       UT start t-T0   Filter Exp.   OT    Err. UL(3sigma)
                     (mid, days)   (s)
2019-01-16 01:34:52 1.94457 r'    10*180 20.09 0.05 22.1

The photometry is based on several nearby PanSTARRS stars.
PanSTARRS_id        r
75670544556329552   16.117
75640544615203120   18.270
75620545839473520   16.802
75610545901287840   14.901
75690546042320496   14.750