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ITC, Sensitivity and Overheads

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The GSAOI Integration Time Calculator (ITC) can be used to determine limiting magnitudes, exposure times, S/N ratios, background levels, etc. for a wide range of source properties, observing conditions and GSAOI configurations. The ITC is divided into five sections: (1) Spatial profile and brightness of source; (2) Spectral distribution of source; (3) Instrument and telescope configuration; (4) Observing conditions; and (5) Details of observation. In the GSAOI ITC, the Strehl is estimated automatically based on selected filter and image quality, using the Strehl values measured for different filters and seeing conditions reported in the GeMS performance web page (see also Defining the CANOPUS AO WFS stars and the GSAOI OT web pages for details). 


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