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GCN Circular 28703

GRB 201020A: Assy optical observations
2020-10-20T17:50:28Z (4 years ago)
Alexei Pozanenko at IKI, Moscow <>
S. Belkin (IKI), A. Pozanenko (IKI), V. Kim (AFIF, Pulkovo Observatory), 
   M. Krugov (AFIF), N. Pankov (HSE), A. Volnova (IKI) report on behalf 

We observed the filed of GRB 201020A  (Ambrosi   et al., GCN 28696) with 
AZT-20 telescope of Assy-Turgen observatory starting on (UT) Oct. 20 
(Ut) 14:00:44 (UT)   in  r'-filter.  We clearly detect optical afterglow 
(Ambrosi   et al., GCN 28696;   Adachi et al., GCN 28697; Fu  et al., 
GCN 28701).

Preliminary photometry of the afterglow is following

Date       UT start  t-T0     Filter  Exp.    OT    Err.   UL (3sigma)
                      (mid, days)        (s)

2020-10-20 14:00:44  0.36688  r'(AB) 70*60    19.70 0.03   23.8

The photometry is based on the nearby stars of PanSTARRS-PS1 catalog.
SDSS-DR12_id        r
J172452.73+312623.9 18.459
J172455.96+312344.8 18.057
J172452.57+312302.1 17.618
J172456.76+312315.5 16.876
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