gll_psc_v08.fit

LAT 2-year Point Source Catalog (FITS format) http://fermi.gsfc.nasa.gov/ssc/data/access/lat/2yr_catalog/

rass_m.fits

Maps of the Soft X-ray Diffuse Background from the ROSAT XRT/PSPC
All-Sky Survey are available in three energy bands, in FITS as well as in GIF format. Clicking on the small images will display full-size (842*595) versions (140 kB). If you want to directly download the files set your browser to “load to local disk...”

http://heasarc.gsfc.nasa.gov/docs/rosat/survey/sxrb/

3/4 keV band (Fig.5b, comparable to Wisconsin M band)