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XMM-Newton Science Analysis System


omfchain (omfchain-1.34.3) [xmmsas_20080701_1801-8.0.0]

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Running The Pipeline

The location of the ODF files is specified by either setting the environment variable SAS_ODF (setenv SAS_ODF directory-path), or by specifying the input directory (omfchain inpdirectory=directory path), or by setting the environment variable SAS_ODF to a SAS summary file. For the latter, the omfchain will extract the directory path from the SAS summary file. Note that SAS-ODF should actually be SASunderscoreODF- latex objects to underscores).

1. Use command `omfchain` to process the ODF data set in the current directory or to where SAS_ODF has been set to, and to place the product files in the current directory.
2. Use command `omfchain inpdirectory=input-directory-path` to process the OM ODF data set in the specified directory, and to place the product files in the current directory.
3. Use command `omfchain outdirectory=output-directory-path` to process the ODF data set in the current directory or to where SAS-ODF has been set to, and to place the output files in the specified directory.
4. Use command `omfchain inpdirectory=input-directory-path outdirectory=output-directory-path` to specify both the location of the ODF data set and the directory where the product files are to be placed.

Apart from the initial automatic creation of the flat-field image, the omfchain can be considered as being divided into 4 subsequent stages for processing each window/event list (see figure 1).

Figure 1: OM Fast Mode Pipeline

1. Tracking history information is turned into graphic products and a file used by the event-list analysis part of the chain.
2. A tracking-shift and flat-field corrected image is created from the event list.
3. The image is source-searched and appropriate extraction regions defined.
4. Background-subtracted light-curves are derived (on a per-exposure basis) for each source from the event list and graphical products are generated.

These four processes run inside a loop over all exposures and all windows. In addition, the last step is executed for all detected sources within each window (see figure 1).