TITLE:   GCN CIRCULAR
NUMBER:  23718
SUBJECT: GRB 190114A: Mondy optical afterglow detectio
DATE:    19/01/15 16:08:15 GMT
FROM:    Elena Mazaeva at IKI, Moscow  <30.v@mail.ru>

E. Mazaeva (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Volnova (IKI), S. Belkin (IKI)  report on behalf of of larger GRB follow-up collaboration:

We observed the field of GRB 190114A (LaPorte et al., GCN 23677) with AZT-33IK telescope of Sayan observatory (Mondy).  We obtained several images in R-filter starting on Jan. 14 (UT) 11:43:08, i.e. ~ 9 hours after the BAT trigger. The afterglow (Siegel et al., GCN 23678; de Ugarte Postigo et al., GCN 23680; Bolmer et al., GCN 23682; de Ugarte Postigo et al., GCN 23687; Selsing et al., GCN 23697) is clearly detected in a stacked image.
Preliminary photometry is following.

Date       UT start t-T0    Filter  Exp.  OT    Err. UL
                     (mid, days)     (s)
2019-01-14 11:43:08 0.37663 R       60*60 20.10 0.09 21.8

The photometry is based on nearby PanSTARRS stars.
PanSTARRS_id          R(applied Lupton' transformation)
110620655351961024    16.89
110610655260315104    17.67
110600655358532464    17.05
110580655437279536    17.37