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We report the discovery of 6.035GHz hydroxyl (OH) maser flares toward themassive star forming region IRAS18566+0408 (G37.55+0.20), which is the onlyregion known to show periodic formaldehyde (4.8 GHz H2CO) and methanol (6.7 GHzCH3OH) maser flares. The observations were conducted between October 2008 andJanuary 2010 with the 305m Arecibo Telescope in Puerto Rico. We detected twoflare events, one in March 2009, and one in September to November 2009. The OHmaser flares are not simultaneous with the H2CO flares, but may be correlatedwith CH3OH flares from a component at corresponding velocities. A possiblecorrelated variability of OH and CH3OH masers in IRAS18566+0408 is consistentwith a common excitation mechanism (IR pumping) as predicted by theory.

Discovery of 6.035GHz Hydroxyl Maser Flares in IRAS18566+0408