TITLE:   GCN CIRCULAR
NUMBER:  23732
SUBJECT: GRB 190114C: LSGT optical observation
DATE:    19/01/16 03:30:37 GMT
FROM:    Joonho Kim at Seoul National U.  <joonho@astro.snu.ac.kr>

Joonho Kim, Myungshin Im, (CEOU/SNU),

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) with the Lee Sang Gak Telescope (LSGT; 0.42m) at the

Siding Spring Observatory. The observation started at about 14.7 hours after

the initial alert, and used g, r, i, z filters with 540 sec of exposure in
each filter.


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


Filter    Date    UT-Start    Mag

g    2019-01-15    10:41:00    20.2 +/- 0.3

r    2019-01-15    10:50:57    19.7 +/- 0.3

i    2019-01-15    11:00:42    18.6 +/- 0.3

z    2019-01-15    11:10:23    18.4 +/- 0.4


Further observations and analysis are being carried out.