TITLE: GCN CIRCULAR NUMBER: 39558 SUBJECT: EP250302a: Xinglong F60B optical observation DATE: 25/03/03 07:52:34 GMT FROM: Liping Xin at NAOC, SVOM xlp@nao.cas.cn

L. P. Xin, X. H. Han, P. P. Zhang, J. Wang, C. Wu, Y. L. Qiu, H. B. Cai, H. L. Li, X. M. Lu, R. S. Zhang, Y. J. Xiao, J. S. Deng, Z. H. Yao, Y. N. Ma, J. Y. Wei (NAOC), X. G. Wang, E. W. Liang (GXU) report:

We observed location of EP250302a (Trigger ID: 01709132186, Dai et al., GCN 39556) with F60B telescope in R band at Xinglong observatory, China. Observations started at 15:42:43 UT on 2025-03-02, 6.5 min after the EP-WXT trigger.

The optical counterpart reported (Zhu et al., GCN 39550, Busmann et al., GCN 39553, Leonini et al., GCN 39553, Wu et al., GCN 39555) within the FXT and XRT locations (Dai et al., GCN 39556, Page et al., GCN 39557) was clearly detected in the stacked image with an exposure time of 10*50 sec. The brightness was estimated to be R=18.36+/-0.13 mag calibrated to USNO B1.0 R2 magnitude.

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