Extended Appendix: From X-rays to High-Energy Gamma-rays: A Comprehensive Multi-Wavelength Study of Early Gamma-Ray Burst Afterglows

This extended abstract provides additional details, figures, tables, and results supporting the analysis presented in the main manuscript titled "From X-rays to High-Energy Gamma-rays: A Comprehensive Multi-Wavelength Study of Early Gamma-Ray Burst Afterglows". We present the complete GRB sample, the selection of time intervals, and additional information on X-ray flaring activity, and the results of the time-resolved broadband spectral analysis. We also provide representative light curves and spectral energy distributions (SEDs), posterior distributions from individual GRB modeling, and additional comparisons between model predictions and observed X-ray and high-energy (HE) γ-ray emission. The main analysis is based on observations from the Neil Gehrels Swift Observatory, using the X-Ray Telescope (XRT) and Burst Alert Telescope (BAT), together with observations from the Fermi Large Area Telescope (LAT). The combined data cover the energy range from 0.3 keV to 300 GeV.