  We use a Monte Carlo technique and assumed spatial distributions of dust and
supernova (SN) progenitors in a simple model of a characteristic SN--producing
disk galaxy to explore the effects of extinction on the radial distributions of
SN properties in their parent galaxies. The model extinction distributions and
projected radial number distributions are presented for various SN types. Even
though the model has no core-collapse SNe within three kpc of the center, a
considerable fraction of the core-collapse SNe are projected into the inner
regions of inclined parent galaxies owing to their small vertical scale height.
The model predicts that because of extinction, SNe projected into the central
regions should on average appear dimmer and have a much larger magnitude
scatter than those in the outer regions. In particular, the model predicts a
strong deficit of bright core-collapse events inside a projected radius of a
few kpc. Such a deficit is found to be present in the observations. It is a
natural consequence of the characteristic spatial distributions of dust and
core-collapse SNe in galaxies, and it leads us to offer an alternative to the
conventional interpretation of the Shaw effect.
