TITLE:   GCN CIRCULAR
NUMBER:  24949
SUBJECT: GRB 190630B: Tien Shan and Koshka Zeiss-1000 optical upper limits
DATE:    19/07/01 21:13:42 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We observed the field of GRB 190630B (Krimm, et al., GCN 24913)   with 
Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting 
on June, 30 (UT) 18:40:21  and  Koshka Observatory starting on June, 30 
(UT) 20:38:42 in  R-filter. We do not detect the afterglow (Zheng, et 
al., GCN  24914; Zheng, et al., GCN  24931). Preliminary photometry of 
the field is following

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

2019-06-30 18:40:21 0.55999 R      6720  n/d   n/d  22.3 TSHAO
2019-06-30 20:38:42 0.63060 R      3780  n/d   n/d  21.9 Koshka

The photometry is based on several nearby USNO-B1.0 stars.
USNO-B1.0_id R2
1315-0255078 18.06
1314-0253302 17.18
1314-0253267 15.88