Jun 23 – 28, 2014
Europe/Zurich timezone

Improving Fermi-LAT Angular Resolution with CTBCORE

Jun 26, 2014, 2:25 PM
Room 5 (Tuschinski Theatre)

Room 5

Tuschinski Theatre

Presentation Gamma-Ray Astrophysics Gamma-Ray Astrophysics


Stephen Portillo (Harvard University)


The Large Area Telescope on the Fermi Gamma-ray Space Telescope has a point spread function with large tails, consisting of events affected by tracker inefficiencies, inactive volumes, and hard scattering; these tails can make source confusion a limiting factor. The parameter CTBCORE, available in the publicly available Extended Fermi-LAT data, estimates the quality of each event's direction reconstruction; by implementing a cut in this parameter, the tails of the point spread function can be suppressed. We implement cuts on CTBCORE and present updated instrument response functions derived from the Fermi-LAT data itself, along with all-sky maps generated with these cuts. Having shown the effectiveness of these cuts, especially at low energies, we encourage their use in analyses where source confusion is important.

Primary author

Stephen Portillo (Harvard University)


Douglas Finkbeiner (Harvard University)

Presentation materials