pn Filter Wheel Closed Data

Small Window (SW) mode


This page provides links to several events files: On the one hand, a link to the merged events file containing the sum of all the EPIC-pn Filter Wheel Closed observations available in the XMM-Newton archive up to a given date; on the other, links to the individual events files that make up the merged events file. A given user may want to use only a specific selection of events to produce tailor made Filter Wheel Closed data. This can be done in either of two ways: by filtering the merged events file and, by combining individual events files.

How to Filter the Merged Event List

Any column in the merged events list can be used for filtering. Columns containing the revolution number (Rev), the observation id (Obsid) and the exposure id (Expid) corresponding to each event have been added to the merged events list. This makes filtering the merged events list for given periods of time easier. For example, if only a particular subset of revolutions of the merged filter wheel closed events list is wanted, the SAS task evselect can be used in the following way: In each case, the file filtered.fits will contain only those events that fulfill the expression.
Information on how to write or combine filter expressions can be found in the documentation of selectlib.

Warning: Filtering the merged events list requires a large amount of memory usage. Users experiencing OutOfMemory problems may want to choose the low-memory-model within SAS (set the SAS environment variable SAS_MEMORY_MODEL to low; see the SAS documentation for more details).

How to Merge Individual Events List

Several individual Filter Wheel Closed events lists can be merged using the SAS task merge. For example, to merge data corresponding to two given revolutions, the merge command would look like this:

  merge set1=file_1 set2=file_2 outset=merged_1.fits mergedifferentobs="yes"

The file merged_1.fits will contain the merge events lists corresponding to the two revolutions. More revolutions can be added simply be merging the corresponding revolution file and the file merged_1.fits. For instance:

  merge set1=file_3 set2=merged_1.fits outset=merged_2.fits mergedifferentobs="yes"

The file merged_2.fits will contain events corresponding to file_1, file_2 and file_3.
Information on additional functionality when merging events files can be found in the documentation of the SAS task merge.



Merged Events List File Size Total Time Image Light Curve Spectra Radiation Monitor
(Rev.560 - Rev.3587) [Mb] [ks] [DETX/DETY] [cts/sec] [Norm. cts] [cts/sec]
Merged Events File 143 178.5
(ps file)

(ps file) (ps file)

(ps file)

(ps file)
Merged OoT Events File 143 178.5

Merged Event List: Merged Filter Wheel Closed events lists. The individual events files have been filtered for periods of background flaring. Columns containing the revolution number (Rev), the observation id (Obsid) and the exposure id (Expid) corresponding to each event have been added to the merged events list. A column Weight has been added to the events lists that contains, for each event, the inverse effective area over one exposure. The SAS task evigweight has been used to compute these weights. The individual events lists that make up the merged file are listed below. The Merged OoT (Out-of-Time) Events File has been produced with the same characteristics as the Merged Events File but contains instead OoT events simulated based on the original event list. See the SAS Manual for a description of the OoT effect and its correction. No individual OoT events files are provided, but they can be extracted if needed following the filtering procedures given above.
File Size[Mb]: Size of the Merged Filter Wheel Closed events list in units of megabyte.
Total Time[ks]: Duration of the merged Filter Wheel Closed exposures in units of kilosecond.
Image: Combined Filter Wheel Closed filtered image in (DETX, DETY). The filter expression used to create these images is (FLAG==0 && PATTERN <= 4). Four images are shown corresponding to different energy ranges: Top Left, energy range 1-2 keV; Top Right, energy range 7.8-8.2 keV; Bottom Left, energy range 7.3-7.6 keV; Bottom Right, false color image (0.3-10. keV). These energy ranges have been chosen to highlight known instrumental spectral features (see the EPIC background section of the XMM-Newton User Handbook for more details).
Light Curve: Combined Filter Wheel Closed filtered 100 seconds bin light curves (green tones). The filter expression used to create these light curves is (FLAG==0 && PATTERN <= 4). The right figure shows the same but includes the light curves corresponding to the high and low energy Radiation Monitor (red).
Spectra: The figure shows the individual spectrum (green) and the mean and RMS spectra (pink) of all filter wheel exposures. The spectra are plotted in 100 eV bins and normalized to the total number of counts in the range 0.3-10 keV. The filter expression used to create these spectra is (FLAG==0 && PATTERN <= 4).
Radiation Monitor: Radiation Monitor 100 seconds bin light curves for high (red) and low (green) energy over the corresponding revolution. Overimposed is the light curve of the corresponding Filter Wheel Closed observation (black). Radiation Monitor data is available here.


Individual Events List Time Observation Start Image Light Curve Radiation Monitor
[ks] [UTC Date] [DETX/DETY] [cts/sec] [cts/sec]
0560_0134522101_EPN_S005 48.5 2002-12-30T10:53:32.0
0621_0150651101_EPN_S001 13.5 2003-04-30T11:32:17.0
0732_0125321101_EPN_S010 13.8 2003-12-07T20:45:26.0
0817_0125321201_EPN_S010 13.8 2004-05-25T11:56:12.0
0910_0160362901_EPN_S005 56.0 2004-11-27T20:20:15.0
0931_0212090401_EPN_S001 5.0 2005-01-07T18:51:55.0
1042_0310990101_EPN_S001 4.0 2005-08-17T21:34:31.0
1979_0412601201_EPN_S003 10.0 2010-09-29T18:41:46.0
3587_0830800301_EPN_S001 14.0 2019-07-10T22:24:29.0


Individual Events List: Filter Wheel Closed events list ([rev]_[obsid]_[instr]_[expid]). The individual events files have been filtered for periods of background flaring. Columns containing the revolution number (Rev), the observation id (Obsid) and the exposure id (Expid) corresponding to each event have been added to the merged events list. A column Weight has been added to the events lists that contains, for each event, the inverse effective area over one exposure. The SAS task evigweight has been used to compute these weights.
Time[ks]: Duration of the Filter Wheel Closed exposure in units of kilosecond.
Observation Start: UTC date and time corresponding to the begining of the observation.
Image: Filter Wheel Closed filtered image in detector coordinates (DETX, DETY). The filter expression used to create these images is (FLAG==0 && PATTERN <= 4). Within each figure, four images are shown corresponding to different energy ranges: Top Left, energy range 1-2 keV; Top Right, energy range 7.8-8.2 keV; Bottom Left, energy range 7.3-7.6 keV; Bottom Right, false color image (0.3-10. keV). These energy ranges have been chosen to highlight known instrumental spectral features (see the EPIC Background section of the XMM-Newton User Handbook for more details).
Note: This set of images is meant to show any spacial structure that could be present, so for displaying purposes, each image has been optimized based on its average number of counts. Hence, images corresponding to different energy ranges or different events files are not to scale.
Light Curve: Filter Wheel Closed filtered 100 seconds bin light curves (green tones). The filter expression used to create these light curves is (FLAG==0 && PATTERN <= 4). The figure includes as well the light curves corresponding to the high and low energy Radiation Monitor (red).
Radiation Monitor: Radiation Monitor 100 seconds bin light curves for high (red) and low (green) energy over the corresponding revolution. Overimposed is the light curve of the corresponding Filter Wheel Closed observation (black). Radiation Monitor data is available here.


General Notes

For the mode-specific spectral and pattern distributions the interested reader is referred to the corresponding calibration report (Sect.4). The set-up change influences the interpretation of the discarded line counter, see Fig.10 of the abovementioned report and the appendix of the early report.

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