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The true parameters are taken (or inferred) from the 3EG catalog assuming a power-law spectrum. See the description of the default parameteriztion in the Likelihood tutoial).
Error estimates for any single fit are given by taking the square root of the diagonal elements of the covariance matrix, which in turn is estimated as the inverse Hessian of the -log-likelihood. Note that the definition of the confidence interval corresponds to a specified change in the log-likelihood along a given direction in parameter space. The estimates obtained from the inverse Hessian are only accurate insofar as the likelihood surface at the local minimum can be accurately represented as a quadratic function of the model parameters. The error estimates reported below are averaged over each set of Monte Carlo trials.
Binned Analysis
Counts maps for the Crab_Pulsar, the hree anticenter sources, and extragalactic diffuse tests are prepared for the following geometry:
E min = 30, E max = 3e5 MeV, 39 bins, logrithmically spaced
RA center = 83 o, eighty 0.5 o pixels
Dec center = 22 o, eighty 0.5 o pixels
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