GCN Circular 29861

WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on

behalf of the KAIT GRB team:


The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at

Lick Observatory, responded to the Swift GRB 210420B (Moss et al.,

GCN 29844
Not found
 
 
) starting at ~0.61 days after the Swift trigger (Lien et al.

GCN 29854
Not found
 
 
). A total of 30x60s images were obtained in the clear (roughly R)

filters. We detect the optical afterglow (Lipunov et al., GCN 29845
Not found
 
 
;
Oksanen,

GCN 29846
Not found
 
 
; Hu et al., GCN 29847
Not found
 
 
; Sun et al., GCN 29848
Not found
 
 
; Leonini et al.,

GCN 29851
Not found
 
 
; de Ugarte Postigo et al., GCN 29852
Not found
 
 
; Watson et al., GCN 29858
Not found
 
 
)

in the coadd image with a mag of 19.9 +/- 0.2, calibrated to the

Pan-STARRS1 catalog.