> Data Process
Processing Version 18.104.22.168
Last Updated 2006 June 13
This is a minor update from version 22.214.171.124. This update does not
affect the products. Users do not have to reprocess your data. Old
versions are summarized in the history page.
- XIS files:
- Timing mode data are not processed.
- Dead time is not calculated when the burst mode option is used.
- Some of the events might have invalid PI values (PI=4095), when
the burst and window options are combined. These events are
effectively removed from the subsequent analysis, resulting in a
slight reduction in normalization. See Suzaku Memo 2006-20 for details.
- Details of the limitations associated in the data processing
are summarized in Suzaku Memo 2006-16.
- The XIS team is preparing background database and
tools to be used by Guest Observers for extended source
analysis. Announcements will be made as soon as these tools are made
- HXD files:
- GSO data in this release still have large calibration
uncertainties. It cannot be used for scientific purpose.
- HXD background estimator is currently being tested by the
- Background event files will be provided by the team.
At present the PIN background subtraction is
accurate at the 5% level, the GSO background is presently under study
and is less reliable.
- Dead-time correction has not been applied to the data, and is
of order 5% for background-dominated sources.
- Common issues:
- There is a time-dependent misalignment of 30-60 arcsec, which is synchronized with the orbital period of the satellite (96 min). This is not incorporated to calculate X/Y in this version. A correction tool is under development.
- Spectral Analyis:
- Response generators are not included in this release; standard
RMF and ARF files can be obtained from CALDB
page. The ARF files are limited to point source files for standard
- In HXD nominal position the response files for XIS0 and XIS1
are not reliable and are offset from XIS2 and 3 and the PIN. Care
should be taken in using these data.
- These responses do not include the XIS contamination, which is
time, position, and sensor dependent. Spatial distibution of the
contamination will also affect the analysis of diffuse sources.
Further details are under preparation.
- The calibraton of the energy scale is underway. XIS gain is
accurate to max(15 eV, 0.5%).
- Effect of the radiation damage is under study now. In
addition, inprecise correction for spatially dependent charge transfer
inefficienty (CTI) results in line broadening of order 50 eV (in
sigma) at Fe K, and a degradation of quantum detection efficiency of
- XIS calibration accuracy becomes worse in window mode or in
- Artificial structure is present in the XIS spectrum in 500-504
ch, which should be discarded from the analysis.
- Local structures may be present in the XIS spectrum with a
level of +-15% in 2-8 keV.
- HXD/PIN response is currently guaranteed in the 12-40 keV
- Users should allow 5% uncertainties in HXD/PIN-XIS
cross-normalization. Further details are under preparation.
- Timing Analysis:
- XIS event times are quantized to 8s (see above). Their
absolute accuracy is not calibrated yet.
- HXD event times have 61 microsec resolution. Absolute timing
accuracy is not yet calibrated to this resolution.
- Barycentric correction software is not included, but it is
- Imaging Analysis:
- Exposure map software is not yet included.
Calibration files and related files can be obtained from the Suzaku
page in ISAS
ISAS/JAXA Department of High Energy Astrophysics
Last Modified: Saturday, 07-Oct-2006 16:12:13 JST