TITLE:   GCN CIRCULAR
NUMBER:  28862
SUBJECT: ZTF20acozryr/AT2020yxz (GRB 201103B): Assy optical observations
DATE:    20/11/07 13:47:08 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

S. Belkin (IKI), M. Krugov (FAI), V. Kim (FAI, Pulkovo Observatory),  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-20 telescope of Assy-Turgen observatory starting on  Nov. 06 
(UT) 19:10:28  in  r'-filter.  We detect the optical transient (Coughlin 
et al., GCN  28841; Coughlin et al., GCN  28841; Xu  et al., GCN 28846; 
Xu  et al., GCN 28854; Mao et al., GCN  28861; ) which can be afterglow 
of GRB 201103B (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 (3sigma)
                      (mid, days)        (s)

2020-11-06 19:10:28  3.06508  r'(AB)  60*60   20.84 0.06   23.1

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