heasarc: nasa's archive of data on energetic phenomena
nasa's high energy astrophysics science archive research center 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.
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