  The 'jet-break' in the X-ray afterglow of gamma ray bursts (GRBs) appears to
be correlated to other properties of the X-ray afterglow and the prompt gamma
ray emission, but the correlations are at odds with those predicted by the
conical fireball model of GRBs. The correlations are in good agreement,
however, with those predicted by the Cannonball model of GRBs.
