  It has been proposed that the temporal coincidence of a gamma-ray burst (GRB)
and a type Ib/c supernova (SN) can be explained with the concept of induced
gravitational collapse (IGC), induced by the matter ejected from an SN Ib/c
accreting onto a neutron star (NS). We found a standard luminosity light curve
behavior in the late-time X-ray emission of this subclass of GRBs. We interpret
this as the result of a common physical mechanism in this particular phase of
the X-ray emission, possibly related to the creation of the NS from the SN
process. Moreover, this scaling law could be a fundamental tool for estimating
the redshift of GRBs that belong to this subclass of events.
