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OH(1720 MHz) masers are excellent signposts of interaction between supernovaremnants(SNRs) and molecular clouds. Using the GBT and VLA we have surveyed 75SNRs and six candidates for maser emission. Four new interacting SNRs aredetected with OH masers: G5.4-1.2, G5.7-0.0, G8.7-0.1 and G9.7-0.0. The newlydetected interacting SNRs G5.7-0.0 and G8.7-0.1 have TeV gamma-ray counterpartswhich may indicate a local cosmic ray enhancement. It has been noted thatmaser-emitting SNRs are preferentially distributed in the Molecular Ring andNuclear Disk. We use the present and existing surveys to demonstrate thatmasers are strongly confined to within 50 degrees Galactic longitude at a rateof 15 percent of the total SNR population. All new detections are within 10degrees Galactic longitude emphasizing this trend. Additionally, a substantialnumber of SNR masers have peak fluxes at or below the detection threshold ofexisting surveys. This calls into question whether maser surveys of GalacticSNRs can be considered complete and how many maser-emitting remnants remain tobe detected in the Galaxy.

Discovery of New Interacting Supernova Remnants in the Inner Galaxy