Left: broadband afterglow SED at T₀ + 1.7 hr and T₀ + 10 hr. X-ray data (filled circles) and optical/NIR photometric points (open symbols) are best fit by a power-law model with index β ≈ 0.8, shown by the dashed line (without absorption/extinction) and by the solid line (including absorption and extinction effects). The dotted shaded curves show the filter response functions. Right: confidence contours for intrinsic extinction A_V and redshift z. Contours show the 68%, 95%, and 99.7% confidence regions. The preferred model corresponds to a high-redshift origin, consistent with an association with G3. The stars indicate the best-fit values for G1 and G2.