TITLE:   GCN CIRCULAR
NUMBER:  24911
SUBJECT: GRB 190627A: Koshka Zeiss-1000 optical counterpart observations
DATE:    19/06/30 03:16:01 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

A. Volnova (IKI), A. Novichonok (KIAM), S. Belkin (IKI),  A. 
Zhornichenko (KIAM), A. Pozanenko (IKI), E. Mazaeva (IKI),  I. Molotov 
(KIAM)  report on behalf of larger GRB IKI FuN collaboration:

We observed the the optical afterglow of GRB 190627A (e.g. Sonbas  al., 
GCN  24888; Siegel al., GCN  24889) with Zeiss-1000 1-m telescope of 
Koshka Observatory on June, 27 and June, 28  in  R-filter.   We clearly 
detect the  afterglow in both epoch. Preliminary photometry of the 
afterglow is following.

Date       UT start   t-T0       Filter Exp.   OT   Err.   UL
                      (mid, days)        (s)

2019-06-27 18:53:57   0.31732    R     180  17.70  0.08  19.9
2019-06-27 19:42:20   0.35092    R     180  17.80  0.07  20.3
2019-06-28 19:22:50   1.36775    R    5400  19.75  0.08  21.5

The photometry is based on the same USNO-B1.0 (R2) stars used in GCNs 
24892 and 24900.