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The fermi large area telescope on orbit: Event classification, instrument response functions, and calibration
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2012 (English)In: Astrophysical Journal Supplement Series, ISSN 0067-0049, E-ISSN 1538-4365, Vol. 203, no 1, 4- p.Article in journal (Refereed) Published
Abstract [en]

The Fermi Large Area Telescope (Fermi-LAT, hereafter LAT), the primary instrument on the Fermi Gamma-ray Space Telescope (Fermi) mission, is an imaging, wide field-of-view, high-energy γ-ray telescope, covering the energy range from 20MeV to more than 300GeV. During the first years of the mission, the LAT team has gained considerable insight into the in-flight performance of the instrument. Accordingly, we have updated the analysis used to reduce LAT data for public release as well as the instrument response functions (IRFs), the description of the instrument performance provided for data analysis. In this paper, we describe the effects that motivated these updates. Furthermore, we discuss how we originally derived IRFs from Monte Carlo simulations and later corrected those IRFs for discrepancies observed between flight and simulated data. We also give details of the validations performed using flight data and quantify the residual uncertainties in the IRFs. Finally, we describe techniques the LAT team has developed to propagate those uncertainties into estimates of the systematic errors on common measurements such as fluxes and spectra of astrophysical sources.

Place, publisher, year, edition, pages
2012. Vol. 203, no 1, 4- p.
Keyword [en]
Instrumentation: detectors, Instrumentation: miscellaneous, Methods: data analysis, Methods: observational, Telescopes
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-104941DOI: 10.1088/0067-0049/203/1/4ISI: 000310908300004ScopusID: 2-s2.0-84867658690OAI: diva2:570344

QC 20121119

Available from: 2012-11-19 Created: 2012-11-14 Last updated: 2012-12-14Bibliographically approved

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Axelsson, MagnusJackson, Miranda S.
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