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X-ray and Gamma-ray Missions (organized by launch date)
These graphs show missions organized by launch date, color coded to indicate whether they are past, current, or future planned missions (blue, green, or gold respectively). For missions where data or data products are archived at the HEASARC, the mission name is also marked with a star symbol.
Missions with flew multiple times, such as rockets and balloons, are shown with the full range of dates, first to last.
A complete list of missions in tabular form and a set of charts sorted by energy range are also available.
Launches from 2008 onwards
Where known, the timeline includeds projected mission duration and possible extended mission time, indicated by a gradual fadeout to the end of the anticipated extended mission timeline.
The PUEO balloon flight in December 2025 — January 2026 does not included a time range to indicate any possible reflights of the instrument package. This will be modified when any reflight proposals are better defined.
The balloon flights for Extreme Universe Space Observatory Super Pressure Balloon (EUSO-SPB1 and -SPB2) reflect two different balloon flights with slightly modified payloads. The two balloon flights XL-Calibur roughly two years apart each lasted several days each.
Launches from 1987 to 2008
XQC (X-ray Quantum Calorimeter) was a microcalorimter flown on 4 separate sounding rocket flights between Dec 4, 1995 and March 11, 2013. Each individual flight lasted several minutes: the time range shown reflects the full range of launches, not the observing time of the flight payloads.
Launches from 1973 to 1987
Launches from 1973 and earlier
The Wisconsin All-sky Survey (WASS) was a proportional counter instrument carried on a sounding rocket flown on several different occasions between 1972 and 1980: each individual flight included minutes of observational time.
Missions archived at the HEASARC
