  For a special value of the mass, a massive graviton on de Sitter space
acquires an enhanced scalar gauge symmetry, and is called partially massless.
The partially massless graviton possesses a duality invariance akin to
electromagnetic duality. We display this duality in its manifestly local and
covariant form, in which it acts to interchange the first order field equations
and Bianchi identities of a gauge invariant field strength.
