XMM-Newton Science Analysis System: User Guide

4.11.2 Processing Steps

The steps to be followed to process a slew datafile are detailed below:

• Download the slew datafile (SDF) into a clean directory, unpack it and point to the directory with the environment variable SAS_ODF
• Run ccfbuild and point to the CCF with SAS_CCF (see § 2.3.3)
• Run odfingest (once finished, set the environment variable SAS_ODF to the new *SUM.SAS file just created) (see § 2.3.4)
• Run epproc (see § 4.3.2)
• Set the SAS_ATTITUDE environment variable to RAF

          export SAS_ATTITUDE=RAF [sh, bash, ksh]
  
          setenv SAS_ATTITUDE RAF [csh, tcsh]
  

  Remember to unset this variable if further processing of pointed observations is going to be performed.
• Run eslewchain

The first four steps are identical to the processing of pointed data.

The task eslewchain divides the slew into a series of small images which are roughly 1 degree by 0.5 degrees in size. Images are created in several energy bands:

1 = 0.2-0.5 keV
2 = 0.5-1.0 keV
3 = 1.0-2.0 keV
7 = 2.0-12.0 keV
6 = 0.2-2.0 keV
8 = 0.2-12.0 keV

For pn slews, images are created using a selection expression of the form:

FLAG==0 && PATTERN==0

for energies between 200-500 eV and

FLAG==0 && PATTERN<=4

for energies $>$ 500 eV

NB: It is imperative to use the Raw Attitude File (RAF) during the processing. If the default attitude is used then source positions will be wrong by roughly 1 arcminute.