Multi-epoch SED of EP241021a from X-ray to NIR frequencies, using Swift/XRT and FTW data. The three epochs correspond to pre-peak, peak, and post-peak SEDs. The uncertainty on the X-ray spectral index (ν^β) is shown as a shaded region, with the median indicated by a dotted line. The dashed lines connecting the X-ray and OIR data use the best-fitting OIR spectral index, β_OIR = −1.09. The X-ray data are consistent with the extrapolation of the OIR spectral index.