GCN Circular 29576
Subject
GRB 210226A: KAIT Optical Upper Limit
Event
Date
2021-02-26T18:29:47Z (5 years ago)
From
Weikang Zheng at UC Berkeley <weikang@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 Swift GRB 210226A (Beardmore et al.,
GCN 29568) starting at 04:56:15 UT, 738s after the burst.
Observations were performed with an automatic sequence in the
clear (roughly R), V, and I filters, and the exposure time was 20s
per image. We do not detect any optical afterglow candidate within
the enhanced XRT position error circle (Goad et al., GCN 29571),
neither in single image, nor in the co-add images. The typical
limiting magnitude of our single clear image is about 19.0 mag
calibrated to the USNOB1.0 catalog. Our result is consistent with
the optical upper limit reported by other groups (Jelinek et al.,
GCN 29570; Romanov, GCN 29572; Lipunov et al., GCN 29574).