TITLE: GCN CIRCULAR NUMBER: 38998 SUBJECT: EP250108a / SN2025kg: Non-detection from ATCA radio follow-up observations DATE: 25/01/20 11:59:13 GMT FROM: Tao An at SHAO, CAS antao@shao.ac.cn

Tao An, Yuanqi Liu (SHAO), Jinjun Geng, Xuefeng Wu (PMO) and Francesco Carotenuto (INAF/OAR) report on behalf of the Einstein Probe radio follow-up team.

EP250108a / SN2025kg was initially discovered and reported by the EP team (Li et al., GCN 38861), followed by the optical conterpart AT2025kg identified (“the kangaroo”; Eyles-Ferris, GCN 38878; Zhu et al., GCN 38885; Malesani et al., GCN 38902; Kumar et al., GCN 38907; Zhu et al, GCN 38908; Levan et al., GCN 38909; Izzo, GCN 38912; Zou et al., GCN 38914; Moskvitin & Spiridonova, GCN 38925; Song et al., GCN 38972; Eyles-Ferris et al., GCN 38983; Xu et al., GCN 38984, Levan et al., GCN 38987).

In the images produced using natural weighting, no significant emission was detected at 5.5 GHz or 9 GHz, with 3σ upper limits of 24 μJy and 18 μJy, respectively. After combining the data from both spectral windows, no signal was detected, resulting in a lower 3σ upper limit of 15 μJy at a central frequency of 7.25 GHz.

We thank the ATCA team for their rapid scheduling and excellent support.

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