GCN Circular 32684

S. Belkin (IKI, HSE), S. Nazarov (CrAO), A. Pozanenko (IKI),  N. Pankov 
(HSE)  report on behalf of IKI GRB FuN:

We observed GRB 221009A/Swift J1913.1+1946 (Dichiara et al., GCN 32632
Not found
 
 
; 
Kennea and Williams, GCN  32635
Not found
 
 
; Veres et al., GCN  32636
Not found
 
 
; Bissaldi et 
al., GCN  32636
Not found
 
 
; Svinkin et al., GCN 32641
Not found
 
 
; Piano et al., GCN 32657
Not found
 
 
; 
Pillera et al., GCN 32658
Not found
 
 
;  Gotz et al., GCN 32660
Not found
 
 
;  Frederiks et al., 
GCN 32668
Not found
 
 
)  with Sintez-Newton 350mm f/5 telescope equipped with QHY600M 
camera and g'r'i'z' filters.  Observation started on 2022-10-10 (UT) 
17:24:54. The series consists of images with an exposure of 120 s in 
r'-filter.

In the stacked image we clearly detect the optical afterglow (e.g. 
Dichiara et al., GCN 32632
Not found
 
 
; Lipunov et al., GCN 32634
Not found
 
 
; Perley GCN 32638
Not found
 
 
; 
Hu et al., GCN 32644
Not found
 
 
; Belkin  et al., GCN 32645
Not found
 
 
; Kuin et al., GCN 32656
Not found
 
 
; 
Kim et al., GCN 32670
Not found
 
 
). Preliminary photometry of the afterglow is following


Preliminary photometry of the stacked images is following

Date       UT start   t-T0    Filter Exp.    OT    err   UL(3)
                      (mid, days)       (s)
2022-10-10 17:24:54   1.16293  r'    40*120  18.43 0.10  20.9

The photometry is based on nearby PS1 stars