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The HEASARC is a multi-mission astronomy archive for the EUV, X-ray, and Gamma ray wave bands. Because EUV, X and Gamma rays cannot reach the Earth's surface it is necessary to place the telescopes and sensors on spacecraft. The HEASARC now holds the data from 25 observatories covering over 30 years of X-ray, extreme-ultraviolet and gamma-ray astronomy. Data and software from many of the older missions were restored by the HEASARC staff. Examples of these archived missions include ASCA, BeppoSAX, Chandra, Compton GRO, HEAO 1, Einstein Observatory (HEAO 2), EUVE, EXOSAT, HETE-2, INTEGRAL, ROSAT, Rossi XTE, Suzaku, Swift, and XMM-Newton.
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The database includes world-wide cosmic-ray neutron observations (pressure-corrected 1 hour counts) since 1953. The date are opened in two formats; one is 4096-byte "longformat" data and the other one is 80-byte "cardformat" data. Since the "cardformat" data are prepared only for quick check of data, the "longformat" data, which include information for data usage (constant, factors, etc), should be used for research works. PS files (compressed) of yearly plots are also available.