Terms such as GRB-supernova (GRB-SN, SN-GRB) are used for
supernovae that produce gamma-ray bursts (GRBs). An increasing number of these
are identified as the technology to trace
the source-location of GRBs has been developed and deployed,
as have more efficient optical transient searches.
Additionally, some evidence of their existence has been discerned
in other GRB and supernovae observations, based on their implied
energy, their frequency of occurrence, and their light curves.
An example is SN 1998bw, presumed to have produced GRB 980425.