TITLE: GCN CIRCULAR NUMBER: 38972 SUBJECT: EP250108a / AT2025kg: GMG Optical Observations DATE: 25/01/18 04:40:23 GMT FROM: Fei-Fan Song at Yunnan Observatories songfeifan@ynao.ac.cn

F.-F. Song, R.-Z. Li, B.-T. Wang, J. Mao, K.-X. Lu and J.-M. Bai (YNAO) report:

We observed the field of EP 250108a (Li et al., GCN 38861, T0 at 2025-01-08T12:30:28.34 UTC) using the GMG-2.4m telescope at the Lijiang Observatory. The observations were made three times, starting at 2025-01-15T14:26:43, 2025-01-16T12:33:50 and 2025-01-16T12:38:36, respectively. The optical counterpart of EP 250108a (Eyles-Ferris, GCN 38878; Zhu et al., GCN 38885; Malesani et al., GCN 38902; Kumar et al., GCN 38907; Zhu et al, GCN 38908; L. Izzo, GCN 38912; Zou et al., GCN 38914; Moskvitin et al., GCN 38925) was detected.

The preliminary analysis results are shown as follows: +---------------+----------+--------------+--------------+ | Tmid-T0 [h] | Filter | Mag | 5-sigma UL | +===============+==========+==============+==============+ | 170.10 | r | 20.75 ± 0.16 | 21.1 | +---------------+----------+--------------+--------------+ | 192.09 | g | 20.78 ± 0.09 | 21.7 | +---------------+----------+----------+------------------+ | 192.17 | r | 20.28 ± 0.07 | 21.6 | +---------------+----------+--------------+--------------+

The given magnitudes are derived based on calibrating against Pan-STARRS1 field stars. We acknowledge the staff at the Lijiang Observatory for conducting the observation.

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