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We present VLA observations in the hydroxyl line OH(1720 MHz) towards thesupernova remnant W28. These high resolution images show a more extensivedistribution of 1720 MHz emission than had previously been suspected fromearlier single-dish observations. A total of 26 distinct maser spots weredetected which lie on the edge of the radio continuum emission from W28 and areunresolved with our 12 arcsec resolution. Significant detection of linear andcircular polarization in the maser spots is also made. The location of themaser spots, together with the physical conditions in the SNR and the adjacentmolecular cloud, argue for a shock excitation mechanism. The possibilities ofusing the OH(1720 MHz) as a powerful diagnostic of the interaction of supernovaremnants with molecular clouds is discussed.Comment: 13 pages, postscript text and two figures in a uuencoded  compressed-tar fil

Shock-excited maser emission from the supernova remnant W28