TITLE:   GCN CIRCULAR
NUMBER:  27566
SUBJECT: GRB 200412B: AbAO optical observations
DATE:    20/04/13 10:09:07 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),  G. V.  Kapanadze (AbAO),   E. Mazaeva (IKI), A. 
Volnova  (IKI),  I. Molotov (KIAM) report on behalf of  GRB IKI FuN:

We observed the field of Fermi GRB 200412B (Fermi GBM team  GCN 27547; 
Longo et al., GCN 27557) with AS-32 (0.7m) telescope of Abastumani 
Observatory starting on 2020-04-12 (UT) 18:42:21.  We  detected  the 
afterglow of GRB 200412B  (Lipunov et al., GCNs 27555; Kumar et al., GCN 
27564).  Preliminary photometry of the afterglow is following.

Date       UT start  t-T0    Filter Exp.  OT    Err. UL
                     (mid, days)     (s)
2020-04-12 18:42:21  0.41783 R      56*60 18.31 0.02 21.3

The photometry is based on nearby USNO-B1.0 stars
UUSNO-B1.0_id R2
1525-0302108 17.21
1524-0300914 17.20
1525-0301929 17.85

[GCN OPS NOTE(13apr20): Removed the extra "GRB" in the SUBJECT-line.]