The Fermi Large Area Telescope On Orbit: Event Classification, Instrument Response Functions, and Calibration

Abstract

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 20 MeV to more than 300 GeV. 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.

169 pages, 90 figures. Corresponding Authors, L. Baldini ([email protected]), E. Charles ([email protected]), and R. Rando ([email protected]) Accepted for publication in ApJ Supplement

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• A New Result on the Origin of the Extragalactic Gamma-ray Background
• High Latitude, Translucent Molecular Clouds as Probes of Local Cosmic Rays
• A Potentially Detectable Gamma-Ray Line in the Fermi Galactic Center Excess -- In Light of One-Step Cascade Annihilations of Secluded (Vector) Dark Matter via the Higgs Portal
• Relativistic jets in narrow-line Seyfert 1 galaxies. New discoveries and open questions
• A source of gamma rays coincident with the shell of the supernova remnant CTB 80
• PSF Calibration of DAMPE for gamma-ray Observations
• Sealed operation, and circulation and purification of gas in the HARPO TPC
• DIRAC framework evaluation for the $\mathbf{Fermi}$-LAT and CTA experiments
• The mid-2016 flaring activity of the flat spectrum radio quasar PKS 2023-07
• Very High Energy gamma-ray emission from RBS 0970
• Gamma-ray detector and mission design simulations
• Determination of the absolute energy scale of the DAMPE calorimeter with the geomagnetic rigidity cutoff method
• Indirect searches for dark matter with the Fermi LAT instrument
• Radiative signatures of electron-ion shocks in BL Lac type objects
• Full-spectrum modeling of mobile gamma-ray spectrometry systems in scattering media
• A Stacked Analysis of GeV Gamma-Ray Emission from SPT-SZ Galaxy Clusters with 16 Years of Fermi-LAT Data
• Search for $\gamma$-ray emission from SNRs in the Large Magellanic Cloud: a new cluster analysis at energies above 4 GeV
• Very high energy $\gamma$-ray emission from RBS 0679
• The Next Generation of Crystal Detectors
• Confronting the dark matter capture rate with a continuous gravitational wave probe of local neutron stars
• Constraints on the gamma-ray emission from Small Solar System Bodies with the Fermi Large Area Telescope data
• Are we really seeing dark matter signals from the Milky Way center?
• Multimessenger Probes of High-energy Sources
• The Fermi Large Area Telescope
• Radio detection of supernova remnant G310.7-5.4 with $\gamma$-ray counterpart: Abeona SNR
• Linear Polarimetry with $\gamma \to e^{+}{e}^{-}$ conversions
• GeV-radio correlation in Markarian 421
• A revisited study of the unidentified $\gamma$-ray emission towards the SNR Kes 41
• Signatures of relic quantum nonequilibrium
• Measurement of 1.7 to 74 MeV polarised gamma rays with the HARPO TPC
• Searching for an additional high-energy component in Fermi-LAT GRB afterglows
• Statistical Measurement of the Gamma-ray Source-count Distribution as a Function of Energy
• A Fast Algorithm for Finding Point Sources in the Fermi Data Stream: FermiFAST
• Optical counterparts of undetermined type $\gamma$-ray Active Galactic Nuclei with blazar-like Spectral Energy Distributions
• Absorption spectra of electrified hydrogen molecules
• Diffuse continuum emission and large extended sources at MeV energies
• Neutrino and $\gamma$-ray Emission from the Core of NGC1275 by Magnetic Reconnection: GRMHD Simulations and Radiative Transfer/Particle Calculations
• The Major Gamma-ray Imaging Cherenkov Telescopes (MAGIC)
• GeV emission in the region of the supernova remnant G51.26+0.11
• GeV emission in the region of Vela: a new view of the supernova remnant
• Measurement of High Energy Gamma Rays from 200 MeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station
• Time stretching of the GeV emission of GRBs: Fermi-LAT data vs geometrical model
• Analysis of shape and angular orientation parameters of velocity-dependent dark matter annihilation signals in Galactic Centers for FIRE simulations
• Broadband Spectral Analysis of 1ES2344+514: A Multi-epoch study