Quantitative unique continuation for a parabolic equation

We address the quantitative uniqueness properties of the solutions of the parabolic equation $\partial_t u - \Delta u = w_j (x,t) \partial_j u + v(x,t) u$ where $v$ and $w$ are bounded. We prove that for solutions $u$, the order of vanishing is bounded by $C(\Vert v\Vert_{L^\infty}^{2/3}+\Vert w\Vert_{L^\infty}^2)$ matching the upper bound previously established in the elliptic case. in the elliptic case.