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We present an edge-on Keplerian disk model to explain the main component ofthe 12.2 and 6.7 GHz methanol maser emission detected toward NGC7538-IRS1 N.The brightness distribution and spectrum of the line of bright masers aresuccessfully modeled with high amplification of background radio continuumemission along velocity coherent paths through a maser disk. The bend seen inthe position-velocity diagram is a characteristic signature of differentiallyrotating disks. For a central mass of 30 solar masses, suggested by otherobservations, our model fixes the masing disk to have inner and outer radii ofabout 270 AU and 750 AU.Comment: To appear in The Proceedings of the 2004 European Workshop: "Dense  Molecular Gas around Protostars and in Galatic Nuclei", Eds. Y. Hagiwara,  W.A. Baan, H.J. van Langevelde, 2004, a special issue of ApSS, Kluwe

NGC7538 Irs1 N: Modeling a Circumstellar Maser Disk