TITLE: GCN CIRCULAR NUMBER: 38613 SUBJECT: EP241217a: NOT optical observations DATE: 24/12/18 10:46:03 GMT FROM: Dong Xu at NAOC/CAS dxu@nao.cas.cn

Z.P. Zhu, X. Liu, D. Xu (NAOC), J.P.U. Fynbo (DAWN/NBI), A. Amanda Djupvik (NOT) report on behalf of a large collaboration:

We observed the field of EP241217a detected by Einstein Probe (EP, Zhou et al., GCN 38586), using the StanCam instrument mounted on the Nordic Optical Telescope (NOT), with 9 x 180 s in the R band. Observations started at 19:14:21 UT on 2024-12-17, i.e. 13.6 hr after the trigger.

The previously reported optical counterpart (Levan et al., GCN 38587 & 38593; Izzo et al., GCN 38588; Fan et al., 38592; Jin et al., GCN 38607) is clearly detected in our stacked image, with a preliminary magnitude of R ~ 20.5 mag (AB), calibrated with nearby PanSTARRS stars and not corrected for Galactic extinction.

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