Supergravity with gauged second order symmetry

A D = 4, N = 1 supergravity model is presented which unites, through a continuous deformation parameter, new minimal supergravity with an extra U(1) gauge multiplet and standard supergravity with local R-symmetry in a formulation with a nonstandard set of auxiliary fields. The deformation gauges a second order symmetry, implements an electromagnetic duality relating the extra U(1) to the R-symmetry, and breaks supersymmetry spontaneously.