  We present Spitzer Space Telescope observations of V1647 Ori, the outbursting
source lighting McNeil's nebula, taken near the optical peak of the outburst in
early March 2004. The source is easily detected in all Spitzer imaging bands
from 3.6 - 70 microns. The fluxes at all wavelengths are roughly a factor of 15
brighter than pre-outburst levels; we measure a bolometric luminosity of 44
Lsun. We posit that this event is due to an increase in the accretion
luminosity of the source. Simple models of an accretion disk plus tenuous
envelope can qualitatively explain the observed pre- and post-outburst spectral
energy distributions. The accretion activity implied by our results indicates
that the outburst may be intermediate between FUor and EXor-type events. We
also report the discovery of a previously unknown mid-infrared counterpart to
the nearby Herbig-Haro object HH 22.
