GTI for HXD

Release of the HXD GTI files during 2006 Mar.-May data

Dear Suzaku users,

From March 14th 2006 to May 13th 2006, the HXD was operated with a lower level of the GSO PSD cut. During this period, the number of GSO events increased and sometimes caused the saturation of data transfer from HXD-AE to DE, especially after SAA passages, or at low COR region. These periods are not removed in the v1.2.x.x data processing due to the limitation of current version of "hxdgtigen" (v1.2). Moreover, this saturation causes uncertainties in the dead-time which cannot be corrected by the current "hxddtcor" ftool. Then, source fluxes artificially vary about 10% during the saturation. Therefore, the HXD team recommends to confirm that your results does not change significantly, even when removing these periods from your v1.2 cleaned event, by use of the GTI files which can be obtained from this page. These GTI files were created with the new "hxdgtigen" (v1.3), which have been newly released as part of version 4 Suzaku FTOOLS (included in Heasoft 6.2). After installing the new version, users can create the same GTI as follows:

unix% hxdgtigen hk_dir="./" hk_file="aeXXXXhxd_0.hk.gz" WPU="0123" \
   gti_fname="aeXXXXhxd_0_tel.gti"

An example effect of new GTI files is shown below. The light curve of the total events obtained with original and new GTI are shown in the upper and lower panel, respectively.

ISAS/JAXA Department of High Energy Astrophysics