[vsnet-grb-info 26360] GRB 200919A: CrAO/ZTSh early optical upper limit

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28460
SUBJECT: GRB 200919A: CrAO/ZTSh early optical upper limit
DATE:    20/09/19 21:12:19 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

S. Belkin (IKI),  V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on 
behalf of IKI-GRB-FuN:

We observed the  GRB 200919A (Ukwatta et al., GCN 28454)  with ZTSH 2.6m 
telescope of CrAO observatory starting on 2020-09-19 (UT) 02:26:25. We 
do not detect any new evident object in the BAT GRB 200919A localization 
field (Ukwatta et al., GCN 28454).
Preliminary photometry of the field is following
Date       UT start  t-T0    Filter Exp.   OT    Err. UL
                     (mid, days)     (s)
2020-09-19 02:26:25  0.02541 R      30*10  n/d   n/d 19.8

The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1224-0243383 15.75
1224-0243414 15.12