Supernova.

Supernova triggers star core collapse.

Explosive supernova triggers star core collapse asymmetrically as the shock wave and powerful gravity of core overcome the strong forces that stabilise atoms and form a new Black Hole. This sudden and violent event provides the possibility for dense matter to escape. The core may impact, at great speed, the forming Black Hole and recoil to produce an ejector that burns at very high energy. Resulting on some Gamma Ray Bursts which are known to originate from supernova events as burning of dense matter.

Gamma Ray Burst (GRB) product of Supernova.