However, a binned analysis is also provided for cases where the unbinned analysis cannot be used. Unbinned likelihood analysis is the preferred method for spectral fitting of the LAT data. This narrative gives a step-by-step description for performing a binned likelihood analysis. (See Likelhood Tutorial: Binned (v03).ĭetection, flux determination, and spectral modeling of Fermi LAT sources is accomplished by a maximum likelihood optimization technique. This tutorial is valid only for ScienceTools versions prior to ScienceTools-09-20-00, all of which use gtexpcube.It is strongly recommended that gtexpcube no longer be used for likelihood analysis, but that it be replaced by gtexpcube2, which is available only in ScienceTools-09-20-00, and above. Likelihood Tutorial: Unbinned – Source Model Definitions. Likelihood Tutorial: Binned (v02: pre-ScienceTools-09-20-00)
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