TITLE: GCN CIRCULAR NUMBER: 37339 SUBJECT: GRB 240828A: KAIT Optical Afterglow Candidate DATE: 24/08/29 16:28:18 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, observed the field of GRB 240828A (The Fermi

GBM team, GCN 37317; Srijan et al., GCN 37328) around the

Fermi/LAT position (Gupta & Lalla, GCN 37331) starting at 03:32,

Aug. 29 UT, about 12.61 hours after the burst. Observations were

performed in 3 x 3 tiling mode, a set of clear (roughly R) filter

images were obtained. Within the XRT afterglow (Beardmore et al.,

GCN 37337) error circle, we detected a bright uncataloged optical

afterglow candidate at J2000 position of (error ~0.5"):

RA: 15:02:02.97

Dec: +36:31:43.93

We estimate the clear band magnitude to be ~17.9 mag at 12.69 hours

after the burst. Further observations are encouraged.

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