Spectral energy distribution modelling of GRB 240218A at different times. The top figures refer to BAT, XRT, and REM data in the t − t₀ = [160–170] s (left) and [178–188] s (right) intervals (indicated by (a) and (b) in Fig. 6). The bottom left panel shows the SED including XRT and REM points taken ∼10³ seconds after the trigger, and the bottom right plot displays the modelling of XRT-LBT data at t − t₀ = 1.26 d. The best model for each SED (shown with blue lines in the plots) and the corresponding parameters are reported in Table 4.