The On-orbit Performance of the Large Area Telescope on Fermi

Details The On-orbit Performance of the Large Area Telescope on Fermi The On-orbit Performance of the Large Area Telescope on Fermi

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346802c&link_type=abstract

American Astronomical Society, AAS Meeting #213, #468.02; Bulletin of the American Astronomical Society, Vol. 41, p.416

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The Large Area Telescope (LAT) is the main instrument on the Fermi Gamma-ray Space Telescope, launched in June 2008. The LAT instrument is performing a continuous all-sky survey during the first year of the Fermi mission. It covers an energy range of 20MeV to >300GeV, with a large instantaneous field of view allowing it to sweep the entire sky every 2 orbits (approx. 190 minutes), with an energy resolution between 5% and 15%, and an angular resolution (68% energy containment) of a few degrees at 100MeV and rapidly improving to less than 1 degree at 1GeV and 0.1 degrees at 100GeV. The LAT is a pair conversion telescope built by a large international collaboration, using silicon micro-strip detectors for tracking of photon pair conversion products, a hodoscopic CsI calorimeter with large dynamic range of energy readout, and a high efficiency, segmented anti-coincidence shield for charged particle background rejection. We summarize the LAT instrument design and capabilities and its on-orbit performance, which is very close to design expectations.
This work is supported by Stanford University and the Stanford Linear Accelerator Center (SLAC) under DoE contract number DE-AC03-76SFO0515 and NASA grant NAS5-00147. Non-US sources of funding also support the efforts of GLAST LAT collaborators in France, Italy, Japan, and Sweden.

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