GCN 44321: EP260416a: KAIT optical upper limit

WeiKang Zheng (UCB), Xuhui Han (NAOC), Pinpin Zhang (NAOC) and

Alexei V. Filippenko (UCB) 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 EP260416a (Hu et al.,

GCN 44307) starting at 05:36, Apr 16 UT, about 7.2 minutes after

the burst. A set of 20s, 40s and 60s clear (roughly R) filter

images were obtained. In our coadd image, we did not detect the

OT (Ducoin et al., GCN 44310; Li et al., GCN 44315; Hua et al.,

GCN 44318; Lee et al., GCN 44319) down to a limiting mag of 21.0

mag (Vega) at a mid-time of 1.3 hours after the burst. Our result

is consistent with the OT reported at a fatiner magnitude by COLIBRÍ

at a similar time (Ducoin et al., GCN 44310).