Afterglows from Jetted Gamma-Ray-Burst Remnant: Does the Light Curve Break?

Afterglows from jetted gamma-ray bursts are generally believed to be characterized by an obvious break in the light curve at the relativistic stage. We show that it is not the case. However, an obvious break does exist at the transition from the relativistic phase to the non-relativistic phase. Although this break itself is parameter-dependent, afterglows from jetted remnant are uniformly characterized by a quick decay during the non-relativistic phase.