GCN Circular 27830

S. Belkin (IKI), V. Kim (AFIF, Pulkovo Observatory), A. Pozanenko (IKI), 
M. Krugov (AFIF),  E. Mazaeva  (IKI),  A. Volnova (IKI)  report on 
behalf of larger GRB IKI FuN collaboration:

We observed Fermi-LAT  GRB 200524A (Dirirsa et al., GCN 27797
Not found
 
 
; see also 
Pookalil et al., GCN 27809
Not found
 
 
; Capalbi  et al., GCN 27811
Not found
 
 
; Gupta et al., 
GCN 27818
Not found
 
 
) with AZT-20 1.5 m telescope  of Assy-Turgen observatory 
starting on May. 26 (UT) 15:34:49  in  r'-filter. Optical afterglow 
discovered by ZTF (Ho et al., GCN 27799
Not found
 
 
) and observed by several 
observations (Kumar et al., GCN 27800
Not found
 
 
; Rumyantsev et al., GCN 27802
Not found
 
 
; 
Sanwal et al., GCN 27803
Not found
 
 
; Perley et al., GCN 27805
Not found
 
 
; Kumar et al., GCN 
27806
Not found
 
 
; de Ugarte Postigo et al., GCN 27807
Not found
 
 
; Blazek et al., GCN 27810
Not found
 
 
; 
Ogawa et al., GCN 27813
Not found
 
 
; Izzo, GCN 27817
Not found
 
 
; Belkin et al., GCN 27820
Not found
 
 
; Kuin 
et al., GCN 27825
Not found
 
 
). Preliminary photometry of the afterglow is following

Photometry of the field is following.

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

2020-05-26 15:34:49   2.4721     r'(AB) 98*60  22.57 0.10  24.4

The photometry is based on the nearby stars of PS1 catalog.
PanSTARRS-PS1_id   r
181072130294808209 20.4066
181072130171186332 20.9877
181082129951473104 20.1196