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XMM-Newton Science Analysis System


arfgen (arfgen-1.70.4) [xmmsas_20060628_1801-7.0.0]

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• Dead time corrections are not considered explicitly in this task, as the EXPOSURE attribute, written to the spectral file by evselect takes into account dead time effects.

• arfgen calls the task attcalc internally. The command line equivalent to this call is attcalc eventset=filteredtable.ds attitudelabel=fixed
  fixedra=RA_PNT fixeddec=DEC_PNT fixedposangle=PA_PNT
  refpointlabel=user nominalra=REFXCRVL nominaldec=REFYCRVL withatthkgen=false

  where filteredtable.ds corresponds to the intermediate event dataset generated by arfgen for the purpose of generating a filtered detector map. The labels in capitals mark global attributes from the spectrum dataset.

  Note that the intermediate event dataset also contains attributes used to initialise the CAL in the subsequent call by attcalc. In order for the CAL to be initialised completely, the following global attibutes are set temporarily as follows:

  For MOS1/2:

  • CCDID $=$ 1
  • CCDNODE $=$ 0
  • DATATYPE $=$ "IMAGE.EL"
  • WINDOWX0 $=$ 0
  • WINDOWY0 $=$ 0
  • WINDOWDX $=$ 610
  • WINDOWDY $=$ 602
  • EDUMODE $=$ 3
  • FRMTIME $=$ 26

  For PN:

  • QUADRANT $=$ 0
  • CCDID $=$ 0
  • CCDNODE $=$ 0
  • CCDMODE $=$ 1
  • DATATYPE $=$ "IMAGE.EL"
  • WINDOWX0 $=$ 0
  • WINDOWY0 $=$ 1
  • WINDOWDX $=$ 64
  • WINDOWDY $=$ 199
  • EDUMODE $=$ 3
  • FRMTIME $=$ 73

  These settings are based on the values found in the ODF files 0070_0123700101/0070_0123700101_M1S00110IME.FIT (MOS1) and 0070_0123700101/0070_0123700101_PNS00301IME.FIT (PN) at the time of writing (14 Oct 2000).

  These will be replaced in future versions of arfgen with the correct values for each CCD for the detector in question.

• The pile-up correction feature is only an initial version which is not maintained. It is strongly recommended that the user should not use this feature.