TITLE:   GCN CIRCULAR
NUMBER:  25683
SUBJECT: ZTF19abvizsw: AbAO and CrAO photometry
DATE:    19/09/07 14:05:41 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), V. 
Rumyantsev (CrAO), A. Volnova  (IKI), E. Mazaeva (IKI),  I. Molotov 
(KIAM) report on behalf of  IKI GRB FuN  collaboration:

We observed the ZTF19abvizsw/AT2019pim (Kool et al., GCN 25616; Burdge 
et al., GCN 25639; Wei et al., GCN 15640; Perley et al., GCN 25643; 
Levan  et al., GCN  25653; Becerra et al., GCN 25655;) with AS-32 (0.7m) 
telescope of Abastumani Observatory and ZTSh telescope of CrAO. 
Preliminary photometry of the the optical transients is following.

date       UT start  MJD    Filter Exp.  OT      OT_err  Obs./Tel.
                      (mid, d)      (s)

2019-09-04 16:54:07 58730.723  R  54*60  21.27   0.16    AbAO/AS-32
2019-09-05 21:49:03 58731.923  R  20*120 21.33   0.14    CrAO/ZTSh

The photometry of the latest epoch of 2019-09-05 might be slightly 
contaminated by red southward star (see also Burdge et al., GCN 25639).
We note the flattening of the initial decay previously reported by 
Becerra (GCN 25655).

The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2
1514-0239703 18.81
1514-0239806 19.68