TITLE:   GCN CIRCULAR
NUMBER:  37286
SUBJECT: GRB 240824B: KAIT optical upper limit
DATE:    24/08/25 21:22:49 GMT
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 GRB 240824B (Fermi GBM team, GCN

37260; Nakajima et al., GCN 37261; DeLaunay et al., GCN 37267;

Sharma et al., GCN 37284) starting at 06:53 UT, Aug. 25, ~17.70

hours after the burst.  A total of 180 x 60s images were obtained

in the clear (roughly R) filters. We did not detect any new optical

counterpart candidate within the Swift/XRT X-ray afterglow

(Source 1) error circle reported by Kennea et al. (GCN 37270) in

our coadd image, which we estimate the limiting magnitude to be

~21.0 mag at a mid time of 20.70 hours after the burst, consistent

with the upper limit report from Malesani et al. (GCN 37281).