XMM-Newton Science Analysis System


arfgen (arfgen-1.92) [xmmsas_20160201_1833-15.0.0]

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Encircled Energy Correction

• Rebin the energy grid used in the main stage by a factor eegridfactor

• For each energy
  • Generate a model of the PSF centred at [xdet,ydet].

  • Loop over each cell in a grid, with resolution given by badpixelresolution, calculating the PSF contribution in every cell. Add the cell contribution to a running total which finally gives the fraction of the PSF within the selected region for this energy

  • Write encircled energy fraction as an element of an encircled energy fraction vector.

• Interpolate EE fraction vector to map to original energy grid used in main stage.

• Divide area vector by EE fraction vector.