GCN Circular 28359

A. Pozanenko (IKI), N. Pankov (HSE), S. Belkin (IKI), A. Volnova (IKI), 
I. Reva (FAPHI), A. Zhornichenko (KIAM), A. Novichonok (Petrozavodsk 
State University, KIAM), S. Naroenkov (INASAN), K.  Antoniuk (CrAO), 
R.Ya. Inasaridze (AbAO), E. Mazaeva (IKI), Sh. Ehgamberdiev (UBAI) 
report on behalf of larger GRB IKI FuN collaboration:

We observed the the field of GRB 200829A (Siegel et al., GCN 28307
Not found
 
 
; Ursi
et al., GCN 28314
Not found
 
 
; Ridnaia et al., GCN 28323
Not found
 
 
; Lesage & Meegan, GCN
28326
Not found
 
 
)  with Zeiss-1000 telescope of TShAO observatory, RC-36 telescope 
of Kitab observatory, Zeiss-1000 telescope of Koshka Observatory, AZT-11 
telescope of CrAO observatory, and AS-23 telescope of AbAO observatory. 
The optical afterglow (Siegel et al., GCN 28307
Not found
 
 
, Pozanenko et al., GCN 
28308
Not found
 
 
; Kuin & Siegel, GCN 28311
Not found
 
 
; Lipunov et al., GCN 28315
Not found
 
 
; Vinko et 
al., GCN 28316
Not found
 
 
; Hentunen et al., GCN 28318
Not found
 
 
; Moskvitin et al., GCNs 
28322
Not found
 
 
, 28328
Not found
 
 
, Zhu et al., GCNs 28324
Not found
 
 
,  28330
Not found
 
 
; Pankov et al., GCN 28329
Not found
 
 
; 
Izzo, GCN 28331
Not found
 
 
; Volnova et al., GCN  28333
Not found
 
 
)  is detected on first two 
days   after GRB trigger. Preliminary light curve of the afterglow in 
R-filter can be found at

http://grb.rssi.ru/GRB200829A/GRB200829A_LC1_R.png

One can tentatively assume a jet break in the light curve at ~0.33 days.

(The photometry is based on nearby USNO-B1.0 stars identical for all 
observations.)