  Cataclysmic astrophysical phenomena can produce impulsive gravitational waves
that can possibly be detected by the advanced versions of present-day detectors
in the future. Gluing of two spacetimes across a null surface produces
impulsive gravitational waves (in the phraseology of Penrose [1]) having a
Dirac Delta function type pulse profile along the surface. It is known that
BMS-like symmetries appear as soldering freedom while we glue two spacetimes
along a null surface. In this note, we study the effect of such impulsive
gravitational waves on test particles (detectors) or geodesics. We show
explicitly some measurable effects that depend on BMS-transformation parameters
on timelike and null geodesics. BMS-like symmetry parameters carried by the
gravitational wave leave some "memory" on test geodesics upon passing through
them.
