  At top RHIC and LHC energies the suppression of high transverse momentum
($p_{\mathrm{T}}$) hadrons provides evidence for partonic energy loss in QGP.
We study partonic energy loss in the RHIC Beam Energy Scan (BES) by
investigating the centrality dependence of the binary-collision-scaled
high-$p_{\mathrm{T}}$ yields. Observing a decrease of the scaled yield in more
central collisions is proposed as a possible signature for jet quenching. Even
at energies and centralities where this signature is lost a QGP may still be
formed since competing phenomena responsible for enhancements may overwhelm the
suppression from energy loss. Measurements in several ranges of
$p_{\mathrm{T}}$ from $\sqrt{s_{_{\mathrm{NN}}}}$ = 7.7, 11.5, 14.5, 19.6, 27,
39, 62.4, and 200 GeV data show that relative hadron suppression persists at
least down to 14.5 GeV.
  To further investigate both the possible formation of a QGP at these lower
energies and whether the observed hadron suppression coincides with the onset
of other QGP signatures, we examine the energy and centrality dependence of
$v_{3}$. Models have shown that the development of $v_{3}$ requires the
presence of a low viscosity phase early in the collision. We find that for
collisions with $N_{\mathrm{part}}$<50, $v_{3}$ disappears for energies below
14.5 GeV, suggestive of a turn-off of the QGP. But for $N_{\mathrm{part}}$>50,
$v_{3}$ persists down to the lowest energies. Together, these signatures
provide possible evidence for the formation of a QGP in the lowest energy
collisions at RHIC.
