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Galactic interstellar emission contributes substantially to Fermi LATobservations in the Galactic plane, where the majority of Supernova Remnants(SNRs) are located. We have developed a method to explore some systematiceffects on SNRs' properties caused by interstellar emission modeling. Wecreated eight alternative Galactic interstellar models by varying a few inputparameters to GALPROP, namely the height of the cosmic ray propagation halo,cosmic ray source distribution in the Galaxy, and atomic hydrogen spintemperature. We have analyzed eight representative candidate SNRs chosen toencompass a range of Galactic locations, extensions, and spectral propertiesusing the eight different interstellar emission models. The models were fittedto the LAT data with free independent normalization coefficients for thevarious components of the model along the line of sight in each region ofinterest. We will discuss the results and compare them with those obtained withthe official LAT interstellar emission model.

A Method for Exploring Systematics Due to Galactic Interstellar Emission Modeling: Application to the Fermi LAT SNR Catalog