The Rossi X-ray Timing Explorer was a space observatory designed to measure rapid X-ray variability, operating from its 1995 launch until 2012. Its time-resolved observations probed accretion and rotation around compact objects such as neutron stars and black holes.
Fast event timing complements an energy spectrum. A narrow feature in a temporal power spectrum identifies an oscillation or rotation frequency of the source, not the frequency of an individual X-ray photon. Comparing such timing features with changes in spectral shape helps distinguish physical states of an accreting system.[ref]
The Rossi X-ray Timing Explorer by NASA. Mission lifetime and compact-source timing goals
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