Supernova

A Type Ia supernova results when an oxygen-and-carbon dominated white dwarf star accretes enough mass to just reach the Chandrasekhar limit - about 1.4 solar masses. It then undergoes a complicated and extremely rapid phase of runaway fusion called deflagration, followed by the core of the star collapsing inward to make a neutron star and its outer layers exploding outward into space. The end result is generally a >1 solar mass neutron star about 11 km in diameter.

To an order of magnitude, how much energy in Joules is released in this collapse?