Calibration of Argus and the 4mm Receiver on the GBT
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The calibration procedures for data collected for Argus and the 4mm Receiver instruments on the GBT are presented. The measured beam size, aperture efficiency, and main-beam efficiency are derived for the range of observing frequencies (66--116 GHz) within the 3mm atmospheric window. The telescope performs well even at the highest frequencies (>100 GHz). The amount of power in the error pattern of the antenna beam is estimated. Approximately 95% of the total antenna power is contained within 1 degree of the pointed direction. The calibration derived using small sources follows theoretical expectations based on the Ruze equation. In general, bright point source calibrators that are monitored regularly by ALMA can be used to accurately derive the main-beam efficiency of the telescope.
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