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This is a fundamental data product used by the science tools. The current definition (version 10 of July 25, 2006 as of this writing) is posted on the Guidelines for Science Tools Design page maintained by Masa Hirayama. This page includes a link to the ft2.tpl template file that is the current working definition of the FT2 format as used by the Science Tools.
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Basically, the file is intended to include the necessary information (other than tables of effective area) for calculating exposures. So it has the position and attitude of the LAT for regularly-spaced time intervals (nominally 30 seconds, although shorter intervals are used when the LAT enters and exits the South Atlantic Anomaly). As currently planned, SAA entry and exit will correspond to the stop and start time for the data taking 'runs' in flight. For orbits that miss the SAA, a run stop/start will be issued when the LAT crosses the orbital plane heading north. \[anders\] -The reason for the forced stop/start has to do with preventing some counters rolling over for very long runs.- For these stop/starts, the interval between the entries may also be less than 30 s. For each of the intervals in an FT2 file the accumulated live time is also recorded. |
This page is open for comments, and for posting additional issues. For clarity, please add the comments in the section to which they refer, by editing the page directly. When the comments settle down, I will post as JIRA issues any specific changes that we converge on for the definition of the FT2 format.
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