TITLE: GCN CIRCULAR NUMBER: 38884 SUBJECT: EP-WXT trigger EP250109a：Xinglong optical follow-up observations DATE: 25/01/10 04:52:16 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn

Report on behalf of the Xinglong collaboration: Junjie-Jin(NAOC), Haiyang-Mu(NAOC), Feng-Xiao(NAOC), Pengliang-Du(NAOC), Ying-Wu(NAOC), Zhou-Fan(NAOC), Hong-Wu(NAOC), Jie-Zheng (NAOC) We observed the field of the X-ray transient, EP 250109a by the Xinglong 2.16-m telescope located at Xinglong, Hebei, China. A total of 6 x 600 s N-band exposures were taken , with a median observation time of 2025-01-09 T13:06:56, approximately 6.5 hours after the EP trigger. No optical counterpart was detected, with a 5-sigma limiting magnitude of 22.48, calibrated with Pan-STARRS sources in the field.

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