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We present a study of the mid-infrared environments and association with starformation tracers of 6.7 GHz methanol masers taken from the Methanol Multi-Beam(MMB) Survey. Our ultimate goal is to establish the mass of the host star andits evolutionary stage for each maser site. As a first step, the GLIMPSE surveyof the Galactic Plane is utilised to investigate the environment of 776methanol masers and we find that while the majority of the masers areassociated with mid-infrared counterparts, a significant fraction (17%) are notassociated with any detectable mid-infrared emission. A number of the masercounterparts are clearly extended with respect to the GLIMPSE point spreadfunction and we implement an adaptive non-circular aperture photometry (ANCAP)technique to determine the fluxes of the maser counterparts. The ANCAPtechnique doubles the number of masers with flux information at all fourwavelengths compared to the number of the corresponding counterparts obtainedfrom the GLIMPSE Point Source Catalogue. The colours of the maser counterpartsare found to be very similar to the smaller study carried out by Ellingsen(2006). The MMB masers are weakly associated with Extended Green Objects (EGOs)and Red MSX Survey (RMS) embedded sources (YSO and HII classifications) with18% and 12% of masers associated with these objects respectively. The majorityof MMB masers (60%) have detectable GLIMPSE infrared counterparts but have notbeen identified with previously recognised tracers of massive star formation;this confirms that the MMB survey has the potential to identify massive starforming regions independent of infrared selection.

The mid-infrared environments of 6.7 GHz Methanol Masers from the Methanol Multi-Beam Survey