  Charm production from the direct reconstruction of $D^0$ ($D^0\to K\pi$ up to
2 GeV/$c$) and indirect lepton measurements via charm semileptonic decays
($c\to e+X$ at 0.9\textless$p_T$\textless5.0 GeV/$c$ and $c\to \mu+X$ at
0.17\textless$p_{T}$\textless0.25 GeV/$c$) at $\sqrt{s_{_{NN}}}=200$ GeV Au+Au
collisions are analyzed. The transverse momentum ($p_T$) spectra and the
nuclear modification factors for $D^0$ and for leptons from heavy flavor decays
is presented. Scaling of charm cross-section with number of binary collisions
at $\sqrt{s_{_{NN}}}=200$ GeV from d+Au to Au+Au collisions is reported.
