Difference between revisions of "Fermi Data"
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* Our original analysis used [http://fermi.gsfc.nasa.gov/ssc/data/analysis/software/v9r31p1.html V9R31p1] of the Fermi Science Tools. We have updated our analysis to use [http://fermi.gsfc.nasa.gov/ssc/data/analysis/software/v9r32p5.html V9R32p5], which includes updates to the IRFs. | * Our original analysis used [http://fermi.gsfc.nasa.gov/ssc/data/analysis/software/v9r31p1.html V9R31p1] of the Fermi Science Tools. We have updated our analysis to use [http://fermi.gsfc.nasa.gov/ssc/data/analysis/software/v9r32p5.html V9R32p5], which includes updates to the IRFs. | ||
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| + | == Data Selection (Ferrer) == | ||
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| + | * We first use [http://fermi.gsfc.nasa.gov/ssc/data/analysis/scitools/help/gtselect.txt gtselect] to create five files, one for each energy bin (e.g. 10 to 20 GeV). We select events of class 3, which corresponds to CLEAN type events following the [http://fermi.gsfc.nasa.gov/ssc/data/analysis/documentation/Cicerone/Cicerone_Data_Exploration/Data_preparation.html Fermi guidelines] for extra-galactic diffuse analysis. Our initial analysis included events up to zenith angle 105deg, and we have updated our scripts to the new recommended value of zenith < 100deg. | ||
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| + | * We then select good time intervals using [http://fermi.gsfc.nasa.gov/ssc/data/analysis/scitools/help/gtmktime.txt gtmktime] and the spacecraft files [ftp://legacy.gsfc.nasa.gov/fermi/data/lat/mission/spacecraft/ PASS7 V6b] or [http://heasarc.gsfc.nasa.gov/FTP/fermi/data/lat/weekly/spacecraft/ PASS7 Reprocessed]. We only keep good data that passes the filter "DATA_QUAL==1 && LAT_CONFIG==1 && ABS(ROCK_ANGLE)<52", which is adequate for a large region of interest as ours. | ||
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| + | The following bash script acomplishes these two steps [[File:noroi.sh]], where filelist.txt contains the names of the weekly files described above. | ||
Revision as of 16:05, 16 May 2014
Fermi LAT datasets used in the analysis
- In the orginal submission we used PASS7 V6b data from August 2008 until September 2013. Specifically, we used the weekly files from week 9 upto and including week 283.
- The referee included data up to January 2014 in his analysis. We have attempted to reproduce her/his results using PASS7 Reprocessed files up to week 307.
Data processing software
- Our original analysis used V9R31p1 of the Fermi Science Tools. We have updated our analysis to use V9R32p5, which includes updates to the IRFs.
Data Selection (Ferrer)
- We first use gtselect to create five files, one for each energy bin (e.g. 10 to 20 GeV). We select events of class 3, which corresponds to CLEAN type events following the Fermi guidelines for extra-galactic diffuse analysis. Our initial analysis included events up to zenith angle 105deg, and we have updated our scripts to the new recommended value of zenith < 100deg.
- We then select good time intervals using gtmktime and the spacecraft files PASS7 V6b or PASS7 Reprocessed. We only keep good data that passes the filter "DATA_QUAL==1 && LAT_CONFIG==1 && ABS(ROCK_ANGLE)<52", which is adequate for a large region of interest as ours.
The following bash script acomplishes these two steps File:Noroi.sh, where filelist.txt contains the names of the weekly files described above.
