Rapidity dependence of strangeness production in central Au+Au collisions at RHIC

We have measured the rapidity distributions dN/dy of charged hadrons, in particular kaons, in central Au+Au collisions at \sqrt{s_NN} = 200 GeV. Preliminary transverse momentum spectra at \sqrt{s_NN} = 62.4 GeV are also presented. This new measurement is used to complete and further discuss the energy and rapidity systematics of strangeness production and its dependence on the variations of the baryo-chemical potential.