NASA High Energy Astrophysics Science Archive Research Center (HEASARC)

This web site is for scientists and astronomy enthusiasts seeking actual data from a multitude of space-based observatories. HEASARC is the primary archive for high-energy astronomy missions, in the extreme ultraviolet, X-ray and gamma-ray wavelengths. On this site, you'll find archival data, multi-mission software and analysis tools, and information about current and past observatory missions. These are all available freely for your use.