The Nancy Grace Roman Space Telescope's Wide Field Instrument (WFI) will have a large field of view (0.28 deg2), Hubble-like sensitivity and resolution over a wavelength range of 0.5 to 2.3 microns with broad-band imaging and slitless spectroscopy, and highly efficient survey operations, enabling survey speeds roughly 1000 times faster than achieved with Hubble. The observing program for the WFI on Roman will include both Core Community Surveys and General Astrophysics Surveys (GAS), defined by a community-led process and traditional peer-reviewed calls for proposals. The majority of observing time during the primary 5-year mission will be devoted to community-defined surveys.
The Core Community Surveys (CCS) are the High Latitude Wide Area Survey, the High Latitude Time Domain Survey, and the Galactic Bulge Time Domain Survey. While Roman's Core Community Surveys are being undertaken in order to meet Roman's cosmology and exoplanet science requirements, the primary goal and responsibility of all the community-defined surveys is to enable a wide range of science investigations. The details below for each of the CCS are distilled from the final report from the Roman Observatory Time Allocation Committee (ROTAC).