Five different theoretical (bolometric) lightcurves from the model presented here, drawn varying the initial energy of the afterglow (E_imp), the dipole magnetic field (B) and the initial spin period (P_i,ms) of the NS. All lightcurves are obtained for the same value of k′ = 0.4. The time at which each lightcurve begins is the deceleration time T_d, estimated for illustration purposes simply by equating the initial energy E_imp to the rest-mass energy of swept up matter in a constant density ISM (n ≃ 1 cm^-3).