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G35.6−0.4 is an extended radio source in the Galactic plane which has previously been identified as either a supernova remnant or an H  ii  region. Observations from the Very Large Array Galactic Plane Survey at 1.4 GHz with a resolution of 1 arcmin allow the extent of G35.6−0.4 to be defined for the first time. Comparison with other radio survey observations show that this source has a non‐thermal spectral index, with   S ∝ν −0.47±0.07  . G35.6−0.4 does not have obvious associated infrared emission, so it is identified as a Galactic supernova remnant, not an H  ii  region. It is  ≈15 × 11 arcmin 2   in extent, showing partial limb brightening.

Re‐identification of G35.6−0.4 as a supernova remnant