TITLE: GCN CIRCULAR NUMBER: 45243 SUBJECT: EP260727a: OHP/T193 optical observations DATE: 26/07/28 13:56:48 GMT FROM: Christophe Adami at LAM <christophe.adami@lam.fr> C. Adami (LAM/Pytheas/AMU), E. Le Floc'h (CEA/Irfu), B. Schneider (LAM), A. Saccardi (CEA/Irfu) report on behalf of a larger collaboration: We observed the field of EP260727a (Hu et al., GCN45235) using the T193cm telescope at Observatoire de Haute-Provence (France) with the MISTRAL spectro-imager. We obtained 14x4 + 1x5 + 1x2 minutes of exposure in the r-band under a 2.1arcsec seeing, starting at 20260728_005726UT (4.3 hr after the Hu et al. trigger) and ending at 20260728_024425UT (6.1 hr after the Hu et al. trigger). In the preliminary stacked images, we detect two potential optical counterparts. The first one is barely detected and consistent with the position of He et al. (GCN 45234), and Eyles-Ferris et al. (GCN 45239). See also Maksut et al. (GCN 45238). We detect it at a preliminar magnitude of: r = 22.82 +/- 0.28 mag We also detect another candidate not present in PanStarrs images at: RA (J2000): 23:05:48.7 DEC (J2000): +03:15:27.4 with preliminary magnitude of: r = 20.49 +/- 0.06 mag The photometric calibration was performed using nearby stars from the PanSTARRS catalog and the STDWeb/STDPipe tools (Karpov 2025), is in the AB system, and is not corrected for Galactic extinction. We acknowledge the excellent support from Observatoire de Haute-Provence and in particular Yoann Degot-Longhi Larralde Erasun. We also thank the SOPHIE observer: Deepanshi Singh. View this GCN Circular online at https://gcn.nasa.gov/circulars/45243. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...