TITLE: GCN CIRCULAR NUMBER: 39797 SUBJECT: GRB 250314A: Keck/NIRC2 J-band upper limit DATE: 25/03/21 06:55:25 GMT FROM: Weikang Zheng at UC Berkeley weikang@berkeley.edu
WeiKang Zheng, Alexei V. Filippenko (UC Berkeley), Chris Fassnacht,
Prayaag Katta (UC Davis), D. B. Malesani (DAWN/NBI) and Jing Wang (NAOC),
report on behalf of the KAIT GRB team:
We observed the field of the SVOM GRB 250314A (Wang et al., GCN 39719)
with the NIRC2 camera on the Keck II 10 m telescope. The observations
were performed in the J band (without AO) starting on 2025 March 16 at
12:54:21 UTC (i.e., 2.0 days after the burst), and consisted of 2x120 s
exposures. At the reported NIR afterglow position (Malesani et al.,
GCN 39727; Malesani et al., GCN 39732), we do not detect any counterpart
with an upper limit of J > 19.4 mag (Vega).
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