  We use Schwinger's proper time method to compute the parity odd contributions
to the U(1) current and energy-momentum tensor of an ideal gas of fermions in
2+1 dimensions in the presence of static gauge and gravitational backgrounds.
From these results the equilibrium partition function at first order in the
derivative expansion is explicitly obtained by integration. The form of the
computed partition function is consistent with general arguments based on
Kaluza-Klein and gauge invariance.
