Parameter space exploration between the initial Lorentz factor, kinetic energy, and deceleration time (color coded) under the early afterglow scenario for three distinct uniform-density ISM regimes (from top to bottom: 10⁻², 1 and 10 cm⁻³. As explained in §A, to explore this possibility, we assume a plausible range of parameters for GRBs using Eq. A.1. The red markers represent the condition t_dec ≈ t_X, peak = 110 ± 50 s.