XMM-Newton SAS: Watchout Page

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XMM-Newton SAS: Watchout Page RGS spectrum of HR1099

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Watchouts

Software requirements

How far can I trust the results of my timing analysis?

Nominally, the X-ray instruments on board XMM-Newton ensure a time resolution ranging from about one hundredth to tens of milliseconds (cf. the XMM-Newton concise instrument overview). However, some effects can affect and partly degrade the nominal accuracy. The main ones can be summarized as follows:

on board time wrap-around events: please refer to the following technical note
jumps in the ground station clocks: these events may sporadically occur during the handover between two antennas tracking the satellite. They imply a time shift of the order of tenths of seconds each. In order to correct for them, a new ODF constituent, the Reconstructed Time Correlation file, is being added to all ODFs. "Reconstructed Time Correlation" is time correlation rebuilt from raw telemetry and corrected for symmetrical ground station clock jumps (i.e. in the case where one ground station experiences a clock jump that disappears with the handover to the next ground station). The SAS is being updated to use the new data and is in the process of scientific validation.

Pages maintained by SAS librarian.
Any question about SAS should be addressed to the XMM-Newton help desk.
Updated on: November 18, 2006