  When a supernova explodes, most of its energy is released in a shell of
relativistic neutirnos which changes the surrounding geometry. We calculate the
potentially observable responses to such a change in both pulsar scintillation
and conventional interferometers. In both cases, the responses are permanent
changes due to such a transient event. This is by-definition a memory effect.
In addition to the transverse component in the usual gravitational memory
(Christodolou effect) effect, it also has a longitudinal component. Furthermore
it is different from the Christodolou effect as the transverse component of
this memory effect also has a term that grows with time.
