Generalized Kahler structures on moduli space of instantons

We show how the reduction procedure for generalized Kahler structures can be used to recover Hitchin's results about the existence of a generalized Kahler structure on the moduli space of instantons on bundle over a generalized Kahler manifold. In this setup the proof follows closely the proof of the same claim for the Kahler case and clarifies some of the stranger considerations from Hitchin's proof.