EP241021a: SAO RAS observations of rebrightening

We observed the field of X-ray transient EP241021a (Hu et al., GCN 37834) with the 1-m telescope of SAO RAS, Zeiss-1000 equipped with the CCD-photometer on October 28 and 29. We detect the OT (Fu et al., GCNs 37840, 37842; Li et al., GCNs 37844, 37846; Ror et al., GCN 37845; Zheng et al., GCN 37849; Moskvitin & Spiridonova, GCN 37850; Pugliese et al., GCN 37852; Pérez-Fournon et al., GCN 37858; Bochenek & Perley, GCN 37869; Kumar et al., GCN 37875; Busmann et al., GCN 37877; J-Jin et al., GCN 37892; Freeburn et al., GCNs 37911, 37942; Quirola-Vasquez et al., GCN 37930) in rebrightening state with the following results. date UT_start--UT_end t_mid-T0 exp, s R magnitude R_lim Oct. 28 19:41:42--23:00:33 7.6758 15 x 300 21.57 +/- 0.08 23.0 Oct. 29 19:55:32--21:03:35 8.6400 12 x 300 21.64 +/- 0.05 23.6 Preliminary photometry was performed in the aperture with r = 2".5, calibrated against nearby SDSS stars (magnitudes converted with Lupton 2005 equations) and not corrected for the Galactic extinction.