NB : this material is not part of the official distribution

11.1-ter HPGSPC event corrections

In the case of the HPGSPC there is one correction needed to be applied to raw events in order to normalize their energy information. The implementation of this correction in XAS is done for analogy to that of the MECS, which is partially unlike the way SAXDAS does it.
As for the MECS all corrections are handled on request, transparently during the primary accumulation of images, spectra, time profiles or photon lists.

These are the kind of corrections and a very brief description of their nature.
In order for correction to be applied during primary accumulations it must currently be explicitly enabled. Otherwise one obtains uncorrected files using raw PHA. Enabling occurs as for the MECS

xasset correction Enabled
But for the HPGSPC they must not be applied when accumulating gain histories !!!

Additionally all primary accumulations programs will currently require an additional argument following all others. THIS IS PROVISIONAL AND WILL BE CHANGED IN THE FUTURE TO USE ENVIRONMENT VARIABLES. This extra arguments is a seed for a random number generator.

  • Time dependency of gain

    The correction of the time dependency of gain (and gain normalization) is enabled as for the MECS:
    xasset gainhistory gainfile
    where gainfile is a gain history produced by the appropriate command

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