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We report the discovery of a partial ~2deg. diameter non-thermal radio shellcoincident with Taz, the pulsar wind nebula (PWN) in the error box of theapparently variable gamma-ray source 3EG J1809-2328. We propose that this radioshell is a newly identified supernova remnant (SNR G7.5-1.7) associated withthe PWN. The SNR surrounds an amorphous region of thermal X-rays detected inarchival ROSAT and ASCA observations putting this system in themixed-morphology class of supernova remnants. G7.5-1.7 is the fifth suchsupernova remnant coincident with a bright GeV source, and the fourthcontaining a pulsar wind nebulae.

Discovery of a New X-ray Filled Radio Supernova Remnant Around the Pulsar Wind Nebula in 3EG J1809-2328