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XMM-Newton Science Analysis System


psechain (psechain-0.1.7) [???]

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Description

The SAS package psechain can be used to process data from EPIC MOS and PN, RGS and OM instruments, starting at the ODF level. It comprises calls to several metatasks, epproc, emproc, rgsproc, omichain, thus performing the whole data reduction corresponding to any combination of chosen data within an observation with the final products of all those metatasks. In addition it allows the user to perform in a semi-automatic way the usual analysis corresponding to a point source by the EPIC data, starting from the source coordinates, and including source extraction radius, background region, and eventual measures to avoid pile-up. Interactivity for optimization of all these parameters can be enabled, which allows the user to select a source and a background regions. For GTI filtering, there are two alternative ways for optimization, the default choice is the use of eregionanalyse, which is applied also automatically in the non interactive case. The alternative to it is an optimization based on maximization of the signal to noise ("MaxSNR") described in the Appendix A of [Pic2004]. In this case the user has to define graphically source and background regions. The final products are spectra with corresponding response matrices and exposure corrected light curves. General source detection can be also enabled for the EPIC data, including control of the main parameters corresponding to edetect_chain. If processing of RGS data is enabled, the whole of rgsproc runs up with eventually defined source coordinates, otherwise the proposal coordinates will be used. For OM analysis, the dedicated chain omichain is ran.

For EPIC spectral and light curve analysis, the standard filtering is applied to the calibrated event list. For PN analysis, the following filter parameters are applied: PATTERN $\le$ 4, FLAG == 0 and #XMMEA_EP. For MOS analysis, the following filter parameters are applied: PATTERN $\le$ 12 (Imaging) and PATTERN == 0 (Timing) , FLAG == 0 and #XMMEA_EM.

psechain creates the following directory structure:

  \[workingDirectory]
    \pn::       epproc products
    \mos::      emproc products
    \rgs::      rgsproc and rgslccorr products 
    \om::       omchain products
    \gti::      GTI filtering products
    \epatplot:: epatplot products
    \images::   edetectchain products
    \spectra::  eregionanalyse and especget products
    \lcurve::   epiclccorr products
    \results::  output log files