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Good Time Interval (GTI) ○◂｜Definition｜1st｜20260130114848-00-⌔
Dictionary: GTI: Good Time Interval - CIAO 4.18
GTI: Good Time Interval
Each Chandra event file contains one or more auxiliary blocks which include the good time intervals. In the case of ACIS, there is one GTI per CCD used in the observation. GTIs are table of sorted START and STOP times in units of seconds. For pipeline-produced data, the GTIs give the time periods when the mission time line parameters fell within acceptable ranges; see the MTL dictionary entry for more information. Additional temporal filtering by the user - such as to remove background flare events - can further restrict these periods. The data subspace lists the GTI filters that have been applied to a file; see the subspace dictionary entry.
The GTIs for pipeline-produced ACIS data are computed in two stages.
Printed 2026-06-28.
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