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The Large Area Telescope on the Fermi Gamma-ray Space Telescope has a pointspread function with large tails, consisting of events affected by trackerineffiencies, inactive volumes, and hard scattering; these tails can makesource confusion a limiting factor. The parameter CTBCORE, available in thepublicly available Extended Fermi LAT data, estimates the quality of eachevent's direction reconstruction; by implementing a cut in this parameter, thetails of the point spread function can be suppressed at the cost of losingeffective area. We implement cuts on CTBCORE and present updated instrumentresponse functions derived from the Fermi LAT data itself, along with all-skymaps generated with these cuts. Having shown the effectiveness of these cuts,especially at low energies, we encourage their use in analyses where angularresolution is more important than Poisson noise.

Sharper Fermi LAT Images: instrument response functions for an improved event selection