TITLE:   GCN CIRCULAR
NUMBER:  23734
SUBJECT: GRB 190114C: KMTNet optical observation
DATE:    19/01/16 09:44:40 GMT
FROM:    Joonho Kim at Seoul National U.  <joonho@astro.snu.ac.kr>

Joonho Kim, Myungshin Im, (CEOU/SNU), Chung-Uk Lee, Seung-Lee Kim (KASI)

report on behalf of a larger collaboration


We observed the optical afterglow of GRB 190114C Gropp et al., GCN 23688,
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, Peak et al. GCN 23731, Kim et al. GCN 23732, Kumar et al.
GCN 23733) with KMTnet 1.6m telescope at the South African Astronomical
Observatory. The observation started at about 22.1 hours after the initial
alert, and used R, I filters with 600 sec of exposure in each filter.


Preliminary photometry is following based on nearby Pan-STARRS stars.

Filter Date UT-Start Mag

R 2019-01-15 18:49:42    19.45 +/- 0.05

I 2019-01-15 18:52:39    18.45 +/- 0.04

Further observations and analysis are being carried out.