Measurement of the Fermi-LAT Localization Performance

Details Measurement of the Fermi-LAT Localization Performance Measurement of the Fermi-LAT Localization Performance

2009-12-19

arxiv.org/abs/0912.3855v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

3 pages, 2009 Fermi Symposium (eConf Proceedings C091122)

Scientific paper

We present results of a study of the localization capability of Fermi-LAT, using a large set of blazars with precise radio locations. Since the width of the PSF decreases with energy, the performance is typically dominated by a few high energy photons, so it is important to properly characterize the high-energy PSF. Using such data, we have found a need to modify the pre-launch high-energy (greater than a few GeV) PSF derived from extensive Monte Carlo simulations of particle interactions in the LAT; the resulting data-based PSF is shown

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