TITLE:   GCN CIRCULAR
NUMBER:  27983
SUBJECT: GRB 200613A: continued Kitab optical observations
DATE:    20/06/18 22:04:59 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

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

We continued observations of GRB 200613A (Fermi GBM team, GCN 27926; 
Bissaldi et al., GCN 27930; Ohno et al., GCN 27931; Yamaoka Ohno et al., 
GCN 27964) with  Kitab-ISON RC-36 telescope in Clear filter. The optical 
afterglow (e.g., Kann et al., GCN 27935; Pozanenko et al., GCN 27937; 
Izzo et al., GCN 27939; Zhu et al., GCN 27943) is detected in a stacked 
image. Preliminary photometry of the afterglow is following

Date,      UT start, t-T0,   Exp.,  Filter, OT,    Err., UL
                     (mid, days)
2020-06-14  16:56:58 1.5086  5460   CR      19.68  0.13  21.2
2020-06-15  16:54:39 2.4997  4200   CR      20.4   0.3   20.4
2020-06-16  16:30:51 3.5005  7200   CR      n/d    n/d   20.5


The photometry is based on nearby SDSS DR12 stars
SDSS-DR12_id        R(Lupton)
J101149.76+454320.7 12.404
J101245.45+455119.1 13.328