GRB 241025A (EP241025a): Optical afterglow observations with the Tsinghua-Nanshan Optical Telescope

We obtained 300sx9 (~12.8 hrs after the burst) and 100sx30 (~13.3 hrs after the burst) r-band images with the 80~cm Tsinghua-Nanshan Optical Telescope (TNOT) located at Nanshan Station of Xinjiang Astronomy Observatory. The afterglow is clearly detected on the stacked images, with the following magnitudes: r = 21.12 +- 0.08 mag (MJD = 60608.60) r = 21.17 +- 0.10 mag (MJD = 60608.62) The above photometric results are calibrated using the field stars from the Pan-STARRS1 catalog and are not corrected for the Galactic extinction.