Question ID = 0020
Question ID = 0020
Assigned Member (担当者)2006-09-21 P. Ranalli (+J.S. Hiraga) 2006-09-25 P. Ranalli (+T. Tamagawa) 2006-10-02 P. Ranalli (+N. Ota) 2006-10-06 P. Ranalli (+Y. Terada) 2006-10-25 P. Ranalli (+A. Kubota) 2006-10-25 P. Ranalli (+N. Isobe) 2006-11-22 P. Ranalli (+A.Kubota) Name and Institute (質問者/機関)Giampiero Tagliaferri (INAF-OABrera, Italy)Question (質問)First question:For the XIS detectors 0,1,3 I can only use the cleaned event files with the read out mode _5x5, the _3x3 files have a big hole in the center (i.e. the events are missing). This hole is not present in the 5x5 files, neither in the not _cleaned 3x3 event files (the _uf.evt files). For the XIS2 detector both cleaned files (3x3 and 5x5) seems ok. Why are all these counts missing from the 3x3 cleaned files of XIS0,1,3? How can I recover them?
Second question:
Third question:
Answer from(回答の文責)Answer (答え)The the XIS data should be reprocessed by changing some parameters related to the accept/rejection probability threshold used by the xis cleaning process.To do this, you should start by opening the uncleaned events ( ......3x3..._uf.evt) in xselect and give the following commands: unix> xselect xsel> read events # (the following is standard criteria for elevation, south atlantic # anomaly, etc) xsel> sel mkf "ELV>5 && DYE_ELV>20 && SAA_HXD==0 && T_SAA_HXD>500" # standard grades xsel> filter grade "0,2-4,6" xsel> extract events xsel> save events Now run cleansis: unix> cleansis chipcol=SEGMENT and please change the "Log Poisson probability threshold" parameter. This parameter is used while looking for hot pixels and controls the treshold for accepting/rejecting the events. A more negative value will reduce the number of rejected counts. You might need some tweaking of this parameter in order to find the best balance between accepted and rejected counts. The output file from cleansis will be the new cleaned events, ready for analysis. If you want to compare the cleansis results with what was done during pipeline processing, you may find the necessary information in the file ..._joblog.html . Status （詳細なステータス）2006-09-21 Accepted2006-09-21 Cont. (Forward the question to the XIS team) 2006-10-02 Cont. (the Software Processing team to check the processing) 2006-10-10 Cont. (the XIS team and Processing team to check errors in xisclean) 2006-10-16 Cont. (error in xisclean suspected, P.I. asked about source flux) 2006-10-25 Cont. (reply from PI, and asked xis-help) 2006-10-27 Cont. (still discussed in the XIS team) 2006-11-02 Cont. (send some suggestions to P.I.) 2006-11-22 Done. (update the web) 
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