  Under the assumption that jets explode core collapse supernovae in a negative
jet feedback mechanism (JFM), I show that rapidly rotating neutron stars are
likely to be formed when the explosion is very energetic. Under the assumption
that an accretion disk or an accretion belt around the just-formed neutron star
launch jets and that the accreted gas spins-up the just-formed neutron star, I
derive a crude relation between the energy that is stored in the spinning
neutron star and the explosion energy. This relation reads
Espin/Eexp~(Eexp/1e52erg). It shows that within the frame of the JFM explosion
model of core collapse supernovae, spinning neutron stars, such as magnetars,
might have significant energy in super-energetic explosions. The existence of
magnetars, if confirmed, such as in the recent super-energetic supernova
GAIA16apd, further supports the call for a paradigm shift from neutrino-driven
to jet-driven core-collapse supernova mechanisms.
