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We present an update on our calculation of the short-distance $D^0$-mesonmixing hadronic matrix elements. The analysis is performed on the MILCcollaboration's $N_f=2+1$ asqtad configurations. We use asqtad light valencequarks and the Sheikoleslami-Wohlert action with the Fermilab interpretationfor the valence charm quark. SU(3), partially quenched, rooted, staggeredheavy-meson chiral perturbation theory is used to extrapolate to thechiral-continuum limit. Systematic errors arising from the chiral-continuumextrapolation, heavy-quark discretization, and quark-mass uncertainties arefolded into the statistical errors from the chiral-continuum fits with methodsof Bayesian inference. A preliminary error budget for all five operators ispresented.

Update on a short-distance D^0-meson mixing calculation with $N_f=2+1$ flavors