Research & Science Home ESA Public Web Site Sci-Tech Portal      XMM-Newton Public Web Site XMM-Newton Sci-Tech Portal
Astrophysics Missions Planetary Exploration Missions Solar Terrestrial Science Missions Fundamental Physics Missions Science Faculty

XMM-Newton SOC
Home Page
Conferences & Meetings
News
Latest News
News Archive
Newsletter
Quarterly Status Report
General User Support
XMM-Newton Helpdesk
Users Group
Proposers Info
Documents & Manuals
AO-14 Information
AO-15 Timeline
OTAC Results
Target Visibility Tool
Target Search Tool
Observers Info
ToO Alert
ToO Details
Proposal Enhancement
Long Term Plan
Short Term Schedule
Scheduled Observations Search
Scheduling Guided Tour
Observation Log Browser
Data Analysis
SAS News
What is SAS?
How to use SAS
SAS Workshops
SAS Version Changes
Download and Install SAS
Science Simulator (SciSim)
Archive, Pipeline & Catalogues
XMM-Newton Science Archive
Pipeline Processing System
Observation & Data Status
Time Correlation Fix
Serendipitous Source Catalogue
OM Serendipitous Source Catalogue
Slew Survey Catalogue
Latest Slew Results
Browsing Interface for RGS Data
Live Radiation Monitor Plots
Radiation Monitor Files
Calibration & Background
Calibration
Background Analysis
SOC Info
XMM-Newton Contact Details
How to get to ESAC
ESA Research Fellowships
ESAC Trainee Projects
ESA Young Graduate Trainees
About XMM-Newton
Image Gallery
XMM-Newton Technical Details
XMM-Newton SOC Overview
XMM-Newton 10th Anniversary
Publications
Publications
Large Programmes
Publication Guidelines
Source Naming Convention
Communicating your Results
Other Links
Project Related Links
Research Projects
Other X-ray Missions
Space Weather Links
Where is XMM-Newton Now?
Search the XMM-Newton website
Fitted XMM-Newton Time Correlation Files



Generation of new fitted Time Correlation Files (TCX) for all XMM-Newton observations: Do I need to care about it?

Improved TCX files are being generated for all the ODFs in the XMM-Newton Science Archive (see also issues #89 and #109 of the XMM-Newton Newsletter). They reduce the scatter of absolute timing measurements in individual observations from 100 to less than 70 micro-seconds (1-sigma). Users are also referred to the EPIC Status of Calibration document (Sect. 8) for further details.

In case of need for such a high precision absolute timing analysis, please, find below instructions on how to make sure that you have access to the new fitted TCX files.

How do I know if my ODF needs a new "fitted" TCX

All ODFs from observations performed in revolution 1915 and above have the new fitted TCX files included.

Information about the range of earlier revolutions for which new fitted TCX files have been generated is available here.
Revolutions for which the fit of the TCX failed and that will need to be inspected individually again at the end of the exercise are marked as well.

In addition, another table lists all ODFs, before revolution 1915, that already have the new fitted TCX file added and that are available (proprietary rights permitting) in the XSA.

All ODFs generated with a new fitted TCX have the following FITS keyword in the TCX file header:

TCXVER=1.4 (or higher)

My ODF does not contain a new fitted TCX. How do I get and use the new TCX nevertheless?

If your ODF is included in the above list of ODFs with new TCX added, then you probably still have an old version. Please check for a new one in the XMM-Newton Science Archive (XSA).

If your ODF is not included in the above list, this may be because of different reasons, namely:
  • The new fitted TCX file has been generated but has not yet been included into the ODF.
    Please, follow the steps here below to 'manually add' the new TCX file:
    • Check the revolution to which your ODF belongs.
    • Check if the new fitted TCX file is generated, as per this table.
    • Download the corresponding TCX file.
    • Rename it to the corresponding ODF TCX constituent (in the directory where the ODF is already exploded):
      • Downloadable TCX files are named: RTX_RRRR.FIT
      • As ODF TCX constituents they have to be re-named to: RRRR_Obsidnumbr_SCX0000TCX.FIT
    • Process your ODF as usually (starting e.g. according to the SAS Start-up Thread).

  • No new fitted TCX file for its revolution has been generated by the SOC yet. The case is under study and the TCX should be generated soon. Contact the SOC (see below) if you need further information. Please remember to mention the Observation Id of the ODF.
Note that if your ODF does not contain a TCX constituent you can still process it with SAS, but the time correlation used will not be the fitted one.

In case of any doubts or further questions, please, do not hesitate to contact the SOC via the XMM-Newton HelpDesk.





XMM-Newton; Europe's X-Ray Observatory
Last update: 05-Oct-2012 by