TITLE:   GCN CIRCULAR
NUMBER:  28875
SUBJECT: ZTF20acozryr/AT2020yxz (GRB 201103B): Mondy, Kitab, TSHAO optical observations
DATE:    20/11/09 23:22:50 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI),  E. Klunko (ISTP), A. Zhornichenko (KIAM), A. Kusakin 
(FAI), I. Reva(FAI),  A. Pozanenko (IKI), N. Pankov (HSE) report on 
behalf of GRB IKI FuN:

We observed the ZTF20acozryr/AT2020yxz (Coughlin et al., GCN  28841) 
with AZT-33IK telescope of Mondy observatory, RC-36 telescope of Kitab 
observatory, and Zeiss-1000 of Tian Shan observatory.  We detect the 
optical transient (Coughlin et al., GCN  28841; Xu  et al., GCN 28846; 
Zhu et al., GCN 28854; Mao et al., GCN  28861; Belkin et al., GCN 28862; 
  Mao et al., GCN 28863) associated with afterglow of GRB 201103B (Ursi 
et al., GCN 28831; Svinkin et al., GCN 28844; Evans  et al., GCN 28858).

Preliminary photometry of the afterglow is following
Date       UT start  t-T0     Filter Exp.    OT    Err.   UL. Telescope
                      (mid, days)      (s)

2020-11-05 21:57:40 2.16938   CR     26*60   n/d   n/d   19.0 RC-36
2020-11-06 15:42:41 2.92217    R     32*120  20.23 0.26  20.5 AZT-33IK
2020-11-06 16:56:13 2.97237    R     32*120  20.49 0.12  21.7 Z-1000
2020-11-08 14:13:52 4.85911    R     32*120  21.50 0.10  23.0 AZT-33IK

The photometry is based on the nearby stars of PanSTARRS-PS1

RA DEC r
02:48:57.72094 +12:12:04.2202 16.6938
02:48:41.68064 +12:09:59.6523 17.0772