Fermi Data

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.

• Subsequently we included data up to January 2014 in the analysis. We use 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. After running this script for the period up to Jan 2014 we obtain the following five files, one for each energy bin Media:noroioutput.tar.gz.

Data Selection (Chen)

Here is the text file of Chen’s Bash script to prepare Fermi-LAT data in the same way: File:Filter 10-60GeV(P7Rep CLEAN).txt. The result products are in weekly files.