TITLE:   GCN CIRCULAR
NUMBER:  24698
SUBJECT: GRB 190530A: AbAO optical observations
DATE:    19/05/31 21:55:33 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), V.R. 
Ayvazian (AbAO), E. Mazaeva (IKI), A. Volnova  (IKI)   report on behalf 
of larger IKI GRB FuN collaboration:

We observed the  optical afterglow (Lipunov et al., GCN 24680, 24693; 
Kann et al., GCN 24684; Melandri et al., GCN  24689; Heintz et al., GCN 
24686; Lzzo et al., GCN  24687; Xin et al., GCN   24688; Watson et al., 
GCN  24690; Xin et al., GCN 24697)  of the Fermi GBM, LAT GRB 190530A 
(Fermi GBM Team, GCN  24676; Longo et al., GCN   24679) with AS-32 
(0.7m) telescope of Abastumani Observatory starting on May  31 (UT) 
17:44:00. Preliminary photometry of the afterglow is following.

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

2019-05-31  17:44:00 1.32171 R     19*60 18.5  0.1  19.5

The photometry is based on nearby USNO-B1.0 stars

USNO-B1.0_id R2
1255-0157926 13.35
1254-0159410 12.63
1255-0157793 13.56