TITLE: GCN CIRCULAR NUMBER: 38560 SUBJECT: EP241208a: NOT optical upper limits DATE: 24/12/13 15:33:41 GMT FROM: Dong Xu at NAOC/CAS dxu@nao.cas.cn

X. Liu, J. An, S.Q. Jiang, S.Y. Fu, Z.P. Zhu, D. Xu (NAOC), J.P.U. Fynbo (DAWN/NBI), A.H. de la Fuente, A.G. Theil (NOT) report:

We observed the field of EP241208a detected by EP-WXT (Wang et al., GCN 38477) and SVOM/ECLAIRs (Atteia et al., GCN 38557) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 02:48:15.84 UT on 2024-12-09, i.e., ~ 10.20 hrs after the EP-WXT trigger, and 5 x 200 s Sloan r- and z- band images were obtained, respectively.

No new optical source is found within the ~ 10 arcsec EP-FXT error circle (Wang et al., GCN 38513) after performing image differencing using the DESI Legacy Survey as template, down to the following 3-sigma limits:

Filter Tmid-T0 (hr) UL (AB) ------------------------------------------- r 10.35 >23.2 z 10.67 >21.7

calibrated with nearby Pan-STARRS stars and not corrected for Galactic extinction.

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