[vsnet-grb-info 26054] GRB 200716C: Kitab optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28154
SUBJECT: GRB 200716C: Kitab optical observations
DATE:    20/07/23 09:34:07 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

S. Belkin (IKI), A. Pozanenko (IKI), A. Zhornichenko (KIAM), A. 
Novichonok (Petrozavodsk State University, KIAM), Sh. Ehgamberdiev 
(UBAI) report on behalf of IKI-GRB-FuN:

We observed GRB 200716C  (Fermi GBM team, GCN 28123; Ukwatta et al GCN 
28124; Ohno et al., GCN 28130; Ursi et al., GCN 28133; Torii et al., GCN 
28139; Xue et al., GCN 28145; Frederiks et al., GCN 28147) with RC-36 
telescope of Kitab observatory starting July 17 (UT) 17:24:57.   The 
optical afterglow (Ukwatta et al., GCN 28124; Lipunov et al., GCN 28125; 
Hu et al., GCN 28126; Kumar et al., GCN 28138; Gokuldass et al., GCN 
28146; Jelinek et al., GCN 28149; Pozanenko et al., GCN 28151; Kann  et 
al., GCN 28152)  is detected in a stacked image. Despite we do not 
detect possible host galaxy (D’Avanzo et al., GCN 28132) the galaxy may 
contaminate photometry result.   Preliminary photometry of the afterglow 
   is following

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

2020-07-17 17:24:57  0.78952 R      59*60  18.2 0.3  18.6

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

USNO-B1.0_id R2
1196-0207884 15.42
1197-0206830 14.99