FERMILWEEK - Fermi LAT Weekly Data

Overview

The Fermi LAT Weekly Data database table provides access to LAT data binned into weekly files by the FSSC's data servers.

For each week, the FSSC provides two FITS files: an all-sky file of photons containing positions, energies, etc. and a spacecraft pointing history file. The underscore separated fields in the file names indicate the file type (photon or spacecraft), the Fermi mission week (e.g., w009 = week 9), the processing version (which will change with each major reprocessing of LAT data), and a version number for the file itself. Note that currently the data may include events from slightly after the official week boundaries, which will be reflected in the start and stop times in the table. Any "run" of LAT data the FSSC receives that starts in a given week is put into the weekly file for that week and not broken up.

Note additional selections must be applied to the weekly files prior to use in a data analysis. See LAT Data Selection Recommendations and Caveats About Analyzing LAT Data for more information.

For queries based on position, energy, and exact times, use the FSSC's LAT data server.

Bulletin

The FERMILWEEK database table was last updated on 17 December 2024.

References

See the FSSC's data analysis page at http://fermi.gsfc.nasa.gov/ssc/data/analysis/.

Provenance

This database table is created by the HEASARC from FITS tables received from the Fermi Science Support Center (FSSC). It is updated on a weekly basis.

Parameters

Week_Number
The Fermi mission week number. Each week begins Thursdays at 00:00:00 UTC.

Time
The start time, in UTC, for data in the weekly photon file.

End_Time
The stop time, in UTC, for data in the weekly photon file.

MET_Start
The observation start time given in Mission Elapsed Time (MET). Mission Elapsed Time is measured in seconds from 2001.0.

MET_End
The observation stop time given in Mission Elapsed Time (MET). Mission Elapsed Time is measured in seconds from 2001.0.

Last_Modified
The time the weekly photon file was last modified, in UTC.

Contact Person

Questions regarding the FERMILWEEK database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:27:38 EDT