Singular monopoles and gravitational instantons

We model A_k and D_k asymptotically locally flat gravitational instantons on the moduli spaces of solutions of U (2) Bogomolny equations with prescribed singularities. We study these moduli spaces using Ward correspondence and find their twistor description. This enables us to write down the Kähler potential for A_k and D_k gravitational instantons in a relatively explicit form.