A Quadruply Lensed SN Ia: Gaining a Time-Delay...Losing a Standard
  Candle
  We investigate the flux ratio anomalies between macro-model predictions and
the observed brightness of the supernova iPTF16geu, as published in a recent
paper by More et al., 2017. This group suggested that these discrepancies are,
qualitatively, likely due to microlensing. We analyze the plausibility of
attributing this discrepancy to microlensing, and find that the discrepancy is
too large to be due to microlensing alone. This is true whether one assumes
knowledge of the luminosity of the supernova or allows the luminosity to be a
free parameter. Varying the dark/stellar ratio likewise doesn't help. In
addition, other macro-models with quadruplicity from external shear or
ellipticity do not significantly improve to model. Finally, microlensing also
makes it difficult to accurately determine the standard candle brightness of
the supernova, as the likelihood plot for the intrinsic magnitude of the source
(for a perfect macro-model) has a full width half maximum of 0.73 magnitudes.
As such, the error for the standard candle brightness is quite large. This
reduces the utility of the standard candle nature of type Ia supernovae.
