  We identify a light echo candidate from Hubble Space Telescope (HST) imaging
of NGC 2441, the host galaxy of the Type Ia supernova 1995E. From the echo's
angular size and the estimated distance to the host galaxy, we find a distance
of 207 +/- 35 pc between the dust and the site of the supernova. If confirmed,
this echo brings the total number of observed non-historical Type Ia light
echoes to three -- the others being SN 1991T and SN 1998bu -- suggesting they
are not uncommon. We compare the properties of the known Type Ia supernova
echoes and test models of light echoes developed by Patat et al. (2005). HST
photometry of the SN 1991T echo shows a fading which is consistent with
scattering by dust distributed in a sphere or shell around the supernova. Light
echoes have the potential to answer questions about the progenitors of Type Ia
supernovae and more effort should be made for their detection given the
importance of Type Ia supernovae to measurements of dark energy.

Astrophysics