FERMILPSC ivo://nasa.heasarc/fermilpsc NASA/GSFC HEASARC Fermi LAT Collaboration 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Fermi Point Source Catalog (4FGL) is a catalog of high-energy gamma-ray sources detected by the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope. The 14-year catalog is an incremental version (4FGL-DR4, for Data Release 4) of the fourth Fermi-LAT catalog of gamma-ray sources. Based on the first fourteen years of science data in the energy range from 50 MeV to 1 TeV, it uses the same analysis methods as the 4FGL- DR3 catalog did for 12 years of data. The spectral parameters, spectral energy distributions, light curves and associations are updated for all sources. This database table was last updated by the HEASARC in February 2024, using the latest electronic data obtained from the Fermi Science Support Center (FSSC) available at <a href="http://fermi.gsfc.nasa.gov/ssc/data/access/lat/14yr_catalog/">http://fermi.gsfc.nasa.gov/ssc/data/access/lat/14yr_catalog/</a>. This is a service provided by NASA HEASARC . 2023arXiv230712546B https://heasarc.gsfc.nasa.gov/W3Browse/all/fermilpsc.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=fermilpsc& GET text/xml 180 99999 true 137.1494 -87.8662 0.166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=fermilpsc GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_fermilpsc&Action=More+Options&Action=Parameter+Search&ConeAdd=1 FERMI 0.166666666666667 Gamma-ray public fermilpsc Fermi LAT 14-Year Point Source Catalog (4FGL-DR4) name Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable flux_1_100_gev Integral Photon Flux 1 to 100 GeV photon/cm^2/s phot.flux;em.gamma double nullable flux_1_100_gev_error 1-Sigma Uncertainty in Photon Flux 1 to 100 GeV photon/cm^2/s stat.error;phot.flux;em.gamma double nullable detection_significance Source Detection Significance (in Sigma Units) in the 100 MeV to 1 TeV Band sigma stat.fit.goodness;instr.background double nullable spectrum_type Spectral Type (PowerLaw, LogParabola, PLSuperExpCutoff) meta.code;spect char nullable alt_gammaray_name_1 Most Recent Corresponding Source in 0, 1, 2, or 3FGL Catalogs (If Any) meta.id.assoc char nullable assoc_name Name of Identified or Likely Associated Source meta.id.assoc char nullable analysis_flags Flags Indicate Possible Issues in Detection or Characterization of Source meta.code.qual short nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable alt_gammaray_name_6 Designation of the Corresponding 4FGL-DR2 Source (If Any) meta.id.assoc char nullable lp_beta_error 1-Sigma Uncertainty on Curvature Parameter for LogParabola Fit stat.error;spect.index double nullable lp_epeak_error 1-Sigma Uncertainty on Peak Energy Estimated From LogParabola Model stat.error;em.energy double nullable semi_major_axis_95 Semi-Major Axis of Error Ellipse at 95% Confidence (degrees) degree phys.angSize.smajAxis;pos.errorEllipse double nullable plec_flux_density_error 1-Sigma Uncertainty on Differential Flux at Pivot Energy in PLSuperExpCutoff Fit photon/cm^2/MeV/s stat.error;phot.flux.density double nullable assoc_prob_bay Probability of Association from the Bayesian Method stat.probability double nullable assoc_prob_lr Probability of Association from the Likelihood Ratio Method stat.probability double nullable plec_epeak Peak Energy Estimated From PLSuperExpCutoff Model Mev em.energy double nullable frac_variability_error 1-Sigma Uncertainty on Fractional Variability stat.error;src.var double nullable lp_index_error 1-Sigma Uncertainty on Photon Index at Pivot Energy for LogParabola Fit stat.error;spect.index double nullable semi_minor_axis_95 Semi-Minor Axis of Error Ellipse at 95% Confidence (degrees) degree phys.angSize.sminAxis;pos.errorEllipse double nullable significance_peak Source Significance in Peak Interval stat.fit.goodness double nullable plec_exp_index_error 1-Sigma Uncertainty on Exponential Index for PLSuperExpCutoff Fit stat.error;spect.index double nullable alt_gammaray_name_4 Designation of the Likely Corresponding Source from 3EG Catalog (If Any) meta.id.assoc char nullable semi_major_axis_68 Semi-Major Axis of Error Ellipse at 68% Confidence (degrees) degree phys.size.smajAxis;pos.errorEllipse double nullable source_type Class Designation for Associated Source src.class char nullable plec_flux_density Differential Flux at Pivot Energy in PLSuperExpCutoff Fit photon/cm^2/MeV/s phot.flux.density double nullable plec_index_s Best Fit Local Photon Index at Pivot_Energy for PLSuperExpCutoff Fit spect.index double nullable data_release Data Release Version meta.version short nullable lp_index Photon Index at Pivot Energy for LogParabola Fit spect.index double nullable tevcat_flag Flag Indicates Possible Association with TeVCat meta.code char nullable lp_flux_density Differential Flux at Pivot Energy in LogParabola Fit photon/cm^2/MeV/s phot.flux.density double nullable tevcat_assoc Designation of the Likely Corresponding Source from the TeVCat Catalog (If Any) meta.id.assoc char nullable position_angle_68 Position Angle of the 68% Semi-Major Axis, East of North (degrees) degree pos.posAng;pos.errorEllipse double nullable assoc_ra Right Ascension of Assoc_Name Counterpart degree pos.eq.ra double nullable lp_flux_density_error 1-Sigma Uncertainty on Differential Flux at Pivot Energy in LogParabola Fit photon/cm^2/MeV/s stat.error;phot.flux.density double nullable lp_epeak Peak Energy Estimated From LogParabola Model Mev em.energy double nullable energy_flux_error 1-Sigma Error in Energy Flux from 100 MeV to 100 GeV erg/cm^2/s stat.error;phot.flux double nullable energy_flux Energy Flux from 100 MeV to 100 GeV erg/cm^2/s phot.flux;em.gamma double nullable plec_exp_index Exponential Index for PLSuperExpCutoff Fit spect.index double nullable lp_curve_significance Significance in Sigma of the Fit Improvement Between PowerLaw and LP Fits stat.fit.goodness double nullable lp_beta Curvature Parameter for LogParabola Fit spect.index double nullable flux_peak Peak Integrated Flux from 100 MeV to 100 GeV photon/cm^2/s phot.flux;em.gamma double nullable assoc_name_alt Alternate Name or Indicates Whether the Source Is Inside an Extended Source meta.id.assoc char nullable alt_gammaray_name_2 Most Recent Corresponding Source in Previous FHL Catalogs (If Any) meta.id.assoc char nullable plec_exp_factor_s_error 1-Sigma Uncertainty on Spectral Curvature for PLSuperExpCutoff Fit stat.error;spect.index double nullable plec_epeak_error 1-Sigma Uncertainty on Peak Energy Estimated From PLSuperExpCutoff Model stat.error;em.energy double nullable bii Galactic Latitude degree pos.galactic.lat double nullable plec_index_s_error 1-Sigma Uncertainty on Local Photon Index for PLSuperExpCutoff Fit stat.error;spect.index double nullable plec_exp_factor_s Best Fit Local Spectral Curvature at Pivot_Energy for PLSuperExpCutoff Fit spect.index double nullable alt_gammaray_name_5 Designation of the Likely Corresponding Source from EGR Catalog (If Any) meta.id.assoc char nullable npred Number of Predicted Events in the Model meta.number double nullable alt_gammaray_name_3 Designation of the Likely Corresponding Source from AGL Catalogs (If Any) meta.id.assoc char nullable plec_curve_significance Significance in Sigma of the Fit Improvement Between PowerLaw and PLEC Fits stat.fit.goodness double nullable time_peak_interval Length of Interval in Which Peak Flux Was Measured s time.interval double nullable semi_minor_axis_68 Semi-Minor Axis of Error Ellipse at 68% Confidence (degrees) degree phys.size.sminAxis;pos.errorEllipse double nullable frac_variability Fractional Variability Computed From the Fluxes in Each Year src.var double nullable source_type_alt Class Designation for Low-Confidence Association src.class char nullable variability_index Measure of the Source Variability src.var.index double nullable assoc_error_radius Position Uncertainty at 68% Confidence Level for Assoc_Name Counterpart degree stat.error;pos double nullable pl_index Photon Index for PowerLaw Fit spect.index double nullable pl_flux_density Differential Flux at Pivot Energy in PowerLaw Fit photon/cm^2/MeV/s phot.flux.density double nullable time_peak Time of Center of Interval in Which Peak Flux Was Measured mjd time.epoch double nullable position_angle_95 Position Angle of the 95% Semi-Major Axis, East of North (degrees) degree pos.posAng;pos.errorEllipse double nullable flux_peak_error 1-Sigma Uncertainty in Peak Flux photon/cm^2/s stat.error;phot.flux;em.gamma double nullable extended_source_name Extended Source Identification meta.id char nullable pl_index_error 1-Sigma Uncertainty on Photon Index for PowerLaw Fit stat.error;spect.index double nullable assoc_dec Declination of Assoc_Name Counterpart degree pos.eq.dec double nullable pivot_energy Energy at Which Error on Differential Flux Is Minimal MeV em.energy double nullable lii Galactic Longitude degree pos.galactic.lon double nullable pl_flux_density_error 1-Sigma Uncertainty on Differential Flux at Pivot Energy in PowerLaw Fit photon/cm^2/MeV/s stat.error;phot.flux.density double nullable