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In the four sections of this form, select the appropriate astronomical source, telescope and instrument configuration, observing conditions, and observation parameters. Click on the calculate button (calculate button) at the bottom of any section to submit the parameters from all the sections to the server or the reset button (reset button) to reset all parameters to their defaults. The results are reported in a separate web page that can be resized and printed.

See the ITC Help for general guidance on use of the Integration Time Calculators, and the (more info) links for specific help on each section of the form.

The GSAOI ITC and Strehl ratios (2013 Dec 10)

In the new Observing Tool (2014 1.2.1) the average Strehl and error and the minimum and maximum Strehl delivered by the Mascot algorithm, and visualized at the bottom of the OT Position Editor (see GSAOI OT Details page), take into account the Image Quality Conditions requested (Strehl ratios and maps for IQ=20%-ile, IQ=70%-ile and IQ=85%-ile conditions). The Strehl provided by the OT are based on the Strehl values measured for different seeing conditions listed in Table 1 of the GeMS Performance web page. For the GSAOI ITC, you can use either the Strehl values provided by the OT or the Strehl values listed in the GeMS Performance web page (Table 1).

Bug in the ITC (2012 September 10)

A bug has been reported in the GSAOI ITC when the "Photometry in software aperture that gives 'optimum' S/N ratio" option in the "Analysis Method" section is used with the "Extended Source with Uniform Surface Brightness" option in the "Spatial profile and brightness" section. Until the problem is fixed, the "Photometry in sofware aperture of diameter 2 arcsec" option has to be used to estimate the exposure time and the signal-to-noise for an "Extended Source with Uniform Surface Brightness". See the Analysis Methods web page for detailed information about the "optimum" aperture used in the case of a uniform surface brightness source.

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