[vsnet-grb-info 22832] GRB 190630B: KAIT Optical Afterglow Confirmation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24931
SUBJECT: GRB 190630B: KAIT Optical Afterglow Confirmation
DATE:    19/07/01 05:41:45 GMT
FROM:    Weikang Zheng at UC Berkeley  <weikang at berkeley.edu>

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 190630B (Krimm et al.,
GCN 24913; Cummings et al. GCN 24918) starting at 310s after the burst.
Observations were performed with a sequence in the clear (roughly R),
V, and I filters, and the exposure time was 60 s per image. Further
analysis on our reported afterglow candidate (Zheng & Filippenko, GCN
24914) shows that the candidate position is within the enhanced XRT
error circle (Page et al., GCN 24919), and its brightness faded more than
2 magnitude during our ~2 hours observing range. We therefore confirm
this is the optical afterglow of GRB 190630B. A preliminary KAIT clear
band light curve is available at:
http://w.astro.berkeley.edu/~zwk/grb/GRB190630B/GRB190630B_kait.jpg