  The surprisingly large value of $r$, the ratio of power in tensor to scalar
density perturbations in the CMB reported by the BICEP2 Collaboration, if
confirmed, provides strong evidence for Inflation at the GUT scale. While the
Inflationary signal remains the best motivated source, a large value of $r$
alone would still allow for the possibility that a comparable gravitational
wave background might result from a self ordering scalar field (SOSF)
transition that takes place later at somewhat lower energy. We find that even
without detailed considerations of the predicted BICEP signature of such a
transition, simple existing limits on the isocurvature contribution to CMB
anisotropies would definitively rule out a contribution of more than $5\%$ to
$r \approx 0.2$,. We also present a general relation for the allowed fractional
SOSF contribution to $r$ as a function of the ultimate measured value of $r$.
These results point strongly not only to an inflationary origin of the BICEP2
signal, if confirmed, but also to the fact that if the GUT scale is of order
$10^{16} GeV$ then either the GUT transition happens before Inflation or the
Inflationary transition and the GUT transition must be one and the same.

Cosmology and Nongalactic Astrophysics;General Relativity and Quantum Cosmology;High Energy Physics - Phenomenology;High Energy Physics - Theory