HXD/GSO Background Files
For Version 1.X processed Data
HXD/GSO non X-ray background (NXB) files for data processed using version 1.2/1.3 are available from this page at ISAS/JAXA. Files for guest observer observation are labeled with the 9-digit sequence number. Those for recent observations should become available with a delay of about a month after the processed data are distributed to the guest observers.
For the details of how the background files have been generated, and the estimated accuracy of these files, please read:
- Suzaku Memo 2007-02, "Modeling of the HXD/GSO background"
- Suzaku memo 2006-43, "Reproducibility of the HXD/GSO Non X-ray Background"
Usage
- The event rate of the GSO background files has not been artifitially inflated by a factor of 10 (unlike those of the PIN background files).
- Users must correct the dead time of the GSO background spectral files as well as the observed spectral file.
- The background event files do not include the Cosmic X-ray Background. However, the CXB is less than 0.1% of the total background rate, and thus it is negligible.
- The accuracy is expected to be as good as +/-3% of the
averaged background. Observers are strongly recommended to
verify the reliability of background, by comparing the model
spectrum and light curve with the "earth occultated data"
which can be obtained using the condition of "ELV<-5."
Due to the change of intruementa set-up, the GSO background rate is
sometimes different from the model significantly during the period
2006 Mar 19 through 2006 May 29 of 2005/3/19 -- 2006/5/29.
Also during this period, the data transfer rate in the instrument sometimes saturated. Observers are advised to elimiante sasturated intervals from the data.
If you have any questions concerning Suzaku, visit the Feedback form.