XMM-Newton Science Analysis System


emanom (goflib-0.20.1) [xmmsas_20230412_1735-21.0.0]

Algorithm

• Open EPIC MOS Event List
• Extract INSTRUME and FILTER attributes from EPIC MOS Event List for error checking
• Use evselect to create EPIC MOS Event List of corner-only chip pixel events.
• Loop through chips 2-7 (since chip 1 has no corner data):
  • Extract LIVETI0n attribute from header.
  • Filter corner-only Event List for current chip in low band (400-800 keV).
  • Filter corner-only Event List for current chip in high band (2500-5000 keV).
  • Calculate hardness ratio of corner-only high_band/low_band counts.
  • From hardness ratio (HR) set anomalous set flag accordingly.
    • G: HR $>$ noan_lim, chip is good.
    • I: noan_lim $>$ HR $>$ anom_lim, chip may be useable for $E<1$ keV.
    • B: HR $<$ anom_lim, chip is not useable for $E<1$ keV.
    • O: chip is not in use.
    • U: the count rate is too low to determine the chip state.