The HXD team has developed a different PIN-NXB model (so-called "bgd_d") than the previous one ("bgd_a"; METHOD=PINUDLCUNIT), based on the same method used to create the GSO-NXB (METHOD=LCFIT). Although this PIN-NXB model (METHOD=LCFITDT) generally shows a better reproducibility, it takes 1-2 months after the finish of pipeline processing to be released since this method needs the one month dataset of calibrated GSO events. Therefore, the HXD team regards the previous model as "quick" background for the purpose of immediate quick-look analysis and will continue to release them at "one week delay" timed, while this new model is regarded as "tuned" background for the final precise analysis. Please note that this new PIN-NXB files are also "dead-time corrected", and hence the analysis procedure is exactly the same between "quick" and "tuned".
The reproducibility of the (tuned) HXD-PIN background model for v2 products is described as a suzakumemo (2008-03).
Observation date | Directory | METHOD * | METHODV ** |
---|---|---|---|
2005-09-02 to 2012-07-31***: | pinnxb_ver2.0_tuned | LCFITDT | 2.0ver0804 |
After 2012-08-01****: | pinnxb_ver2.2_tuned | LCFITDT | 2.2ver1403 |
The directory is divided into subdirectories by month. For example, background files for observations carried out in 2006 August can be found in the subdirectory 2006_08. Within these monthly directories, individual background files are listed alphabetically. Note these files are named using the sequence number, e.g., ae100005010_hxd_pinbgd.evt.gz. These files should only be used with version 2.x processed data, and vice versa.
If you have any questions, please contact Suzaku Help Desk.