TITLE: GCN CIRCULAR NUMBER: 38425 SUBJECT: EP241201a: NOT optical observations DATE: 24/12/03 06:06:27 GMT FROM: Dong Xu at NAOC/CAS dxu@nao.cas.cn
X. Liu, S.Q. Jiang, S.Y. Fu, Z.P. Zhu, J. An, D. Xu (NAOC), J.P.U. Fynbo (DAWN/NBI), A.H. de la Fuente, A.G. Theil (NOT) report:
We observed the field of EP241201a detected by EP-WXT (Chen et al, GCN 38415) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 2024-12-02T19:53:15, i.e., ~ 22.9 hrs after the EP-WXT trigger, and 5x200 s Sloan r-filter images were obtained.
No reliable optical transient is found within the EP-WXT 2.34 arcmin error circle (Chen et al, GCN 38415) after performing image differencing using the DESI Legacy Survey as template, down to a 5-sigma upper limit of r > 22.5, calibrated with nearby Pan-STARRS stars and not corrected for Galactic extinction.
In addition, the plausible optical transient candidate reported by Kinder (Lee et al, GCN 38418) is not present in our stacked image.
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