pn Filter Wheel Closed Data
Burst (Bu) mode
This page provides links to several event files: On the one hand, a link to the merged event 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 event files that make up themerged event 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 event file and, by combining individual event files.
How to Filter the Merged Event List
Any column in the merged event list can be used for filtering. A column (Rev) containing the revolution number corresponding to each event has been added to the merged event list. This makes filtering the merged event list for given periods of time easier. For example, if only a particular subset of revolutions of the merged filter wheel closed event list is wanted, the SAS task evselect can be used in the following way:
- If only data from a given revolution range wants to be used:
evselect table=pn_closed_BU_2011_v1.fits expression="(Rev>=780 && Rev<=970)" withfilteredset=yes filteredset=filtered.fits - If a given revolution wants to be excluded:
evselect table=pn_closed_BU_2011_v1.fits expression="(Rev!=780)" withfilteredset=yes filteredset=filtered.fits - Nevertheless, if filtering based on TIME is required, the following expression will select only a given time period:
evselect table=pn_closed_BU_2011_v1.fits expression="TIME>=2.1803e+08 && TIME<=2.4070e+08" withfilteredset=yes filteredset=filtered.fits
The TIME is expressed in terms of number of seconds since the reference time (1998-01-01T00:00:00)
Information on how to write or combine filter expressions can be found in the documentation of selectlib.
Warning: Filtering the merged event 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 Event List
Several individual Filter Wheel Closed event 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
The file merged_1.fits will contain the merge event 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
The file merged_2.fits will containt events corresponding to file_1, file_2 and file_3.
Information on additional functionality when merging event files can be found in the documentation of the SAS task merge.
| Merged Event List | File Size | Total Time | Image | Light Curve | Radiation Monitor |
| (Rev.611 - Rev.705) | [Mb] | [ks] | [RAWX/RAWY] | [cts/sec] | [cts/sec] |
| Merged Event File | 47 | 44.48 |
(ps file) |
(ps file) (ps file) |
(ps file) |
Merged Event List: Merged Filter Wheel Closed event list. No filtering expression has been applied during the generation of the event lists. A column with the revolution number has been added to the event list. The individual event lists that make up the merged file are listed below.
File Size[Mb]: Size of the Merged Filter Wheel Closed event 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 (RAWX, RAWY). 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 0.2-10 keV; Top Right, energy range 1-2 keV; Bottom Left, energy range 7.8-8.2 keV; Bottom Right, energy range 7.2-9.0 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). The filter expression used to create these light curves is (FLAG==0 && PATTERN <= 4). No energy cut has been applied. The right figure shows the same but includes 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. Overimpossed is the light curve of the corresponding Filter Wheel Closed observation (black). Radiation Monitor data is available here
| Individual Event List | Time | Observation Start | Image | Light Curve | Radiation Monitor |
| [ks] | [UTC Date] | [RAWX/RAWY] | [cts/sec] | [cts/sec] | |
| 0611_0145841001_EPN_S001 | 11.2 | 2003-04-11T10:26:47.0 |
|
|
|
| 0705_0154150501_EPN_S003 | 33.2 | 2003-10-15T06:08:47.0 |
|
|
|
Individual Event List: Filter Wheel Closed event list ([rev]_[obsid]_[instr]_[expid]). No filtering expression has been applied during the generation of the event lists. A column with the revolution number has been added to the event list.
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 (RAWX, RAWY). 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 0.2-10 keV; Top Right, energy range 1-2 keV; Bottom Left, energy range 7.8-8.2 keV; Bottom Right, energy range 7.3-7.6 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 event files are not to scale.
Light Curve: Filter Wheel Closed filtered 100 seconds bin light curves (green). The filter expression used to create these light curves is (FLAG==0 && PATTERN <= 4). No energy cut has been applied. 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. Overimpossed 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.