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Abstract
Six sources with 4765-MHz maser emission from the 2Π1/2J = 1/2 excited level of OH have been monitored for a period of more than a year. One of these sources, G294.51-1.62, is a new detection. No masers were detected at either 4750 or 4660 MHz. The narrowest lines are not resolved in the 0.190 km s−1 resolution spectra but their velocities have been constant throughout the observation period. One source, Mon R2, flared to more than 30 Jy, while all other sources varied by < 1 Jy on time-scales of months.
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