The WFIRST Galaxy Survey Exposure Time Calculator is Chris Hirata's exposure time calculator for use in optimizing hardware requirements and observing strategy for the WFIRST High Latitude Survey (HLS). It takes known galaxy properties to predict the limiting magnitudes and statistical properties of sources that can be detected by WFIRST for gravitational weak lensing and the galaxy redshift survey. It also has modes to help with the photo-z calibration emission line sensitivities and with estimating the spectral continuum sensitivity. The current update (version 14) of this code incorporates changes made for the AFTA study. Several configuration files are now available, including the WFI direct imaging and grism modes as well as the IFC detector mode.
Pandeia, named for the Greek goddess of brightness, is a multi-mission exposure time calculator built at STScI to support JWST. Pandeia calculates a detailed and accurate system performance for a wide variety of science cases and includes support for direct imaging, slitless spectroscopy, IFC spectroscopy, and coronagraphy. It is not limited to calculations of a single source, and includes the ability to build complex astronomical scenes. STScI has extended Pandeia to support WFIRST. It implements the current WFIRST optical reference information. Download instructions, tutorial notebooks, and references are available through a GitHub repository. Users are encouraged to address questions, suggestions, and bug reports to email@example.com with "Pandeia-WFIRST question" in the subject line. The message will be directed to the appropriate members of the Pandeia-WFIRST team at STScI.