FOC Exposure Time
Simulators
An interface to FOCSIM has been developed for WWW as part of the FOC team's Instrument Pages (see Chapter 9). This form allows the user to simulate a single point-source in the standard 512 x 512 FOC F/96 (pre- and post-COSTAR) imaging format with average values for the background sources. The user can choose to calculate an exposure time needed to reach a desired S/N or to calculate the S/N for a given exposure time using either observed or theoretical PSFs. Finally, library spectra or synthetic spectra can be normalized to user specified values, although user supplied spectra can not be used with this form.
The short, easy to use graphical interface afforded by the WWW browsers makes this simulation quick to use with results being returned to the user in a very short time. The full ASCII output of FOCSIM gives all the calculated count rates for the source and background and can be saved by Mosaic to the users local disk for later reference.
Along with the fill-out form for running FOCSIM, the FOCSIM Beginners Manual is also available on WWW. Both the Beginners Manual and the FOCSIM form can be found at URL
http://www.stsci.edu/ftp/instrument_news/FOC/Foc_tools/focsim/focsim.html
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