A collapsar is a type of black hole formed inside of a massive star that rotates at a sufficient rate to create a disk around the hole. The model for collapsars was originally developed to explain gamma-ray burst events accompanying supernovas, but the model now includes other forms. Type I collapsars form an initial neutron star but fail to go supernovae, and after a one-second delay, collapse into black holes. Type II collapsars explode, but not enough mass is ejected, and the neutron star falls back into a black hole. Type III collapsars collapse directly into massive black holes.
See also List of collapsars Shell collapsar Gamma-ray burst Compact star
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