Description Usage Format Details Fields Source
Fermi Large Area Telescope Second Source Catalog (3FGL). Acero, F. et al., The Astrophysical Journal Supplement Series, 218, 23 (2015).
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A data frame with 224 variables on 3034 gamma-ray sources.
Initial Release: 9 January 2015 Latest Release: gll_psc_v16.fit (18 May 2015)
3FGL JHHMM.m+DDMM[c/e], constructed according to IAU Specifications for Nomenclature; m is decimal minutes of R.A.; in the name R.A. and decl. are truncated at 0.1 decimal minutes and 1' , respectively; 'c' indicates that based on the region of the sky the source is considered to be potentially confused with Galactic diffuse emission; e indicates a source that was modeled as spatially extended (see Section 3.4 of 2FGL paper)
Right Ascension, J2000, deg, three decimal places
Declination, J2000, deg, three decimal places
Galactic longitude, deg, three decimal places
Galactic latitude, deg, three decimal places
Semimajor radius of 68% confidence region, deg, three decimal places
Semiminor radius of 68% confidence region, deg, three decimal places
Position angle of 68% confidence region, deg. east of north, 0 decimal places
Semimajor radius of 95% confidence region, deg, three decimal places
Semiminor radius of 95% confidence region, deg, three decimal places
Position angle of 95% confidence region, deg. east of north, 0 decimal places
ROI number (cross-reference to ROIs extension)
Source significance (in sigma units) derived from likelihood TS for 100 MeV\342\200\223300 GeV analysis, one decimal place
Energy at which error on differential flux is minimal, in MeV
Differential flux at Pivot_Energy, in cm^-2 MeV^-1 s^-1
1 sigma error on differential flux at Pivot_Energy, in cm^-2 MeV^-1 s^-1
Best-fit photon number power-law index: For LogParabola spectra, index at Pivot_Energy; for PLExpCutoff spectra, low-energy index.
1 sigma error on Spectral_Index
Integral flux from 1 to 100 GeV, in cm^-2 s^-1
1 sigma error on integral flux from 1 to 100 GeV, in cm^-2 s^-1
Energy flux from 100 MeV to 100 GeV obtained by spectral fitting, in erg cm^-2 s^-1
1 sigma error on energy flux from 100 MeV to 100 GeV, in erg cm^-2 s^-1
Significance (in sigma units) of the fit improvement between power-law and either LogParabola (for ordinary sources) or PLExpCutoff (for pulsars). A value greater than 4 indicates significant curvature.
Spectral type (PowerLaw, LogParabola, PLExpCutoff, PLSuperExpCutoff)
Curvature parameter (Beta) for LogParabola. NULL for other spectral types
1 sigma error on Beta for LogParabola. NULL for other spectral types
Cutoff energy (E_c for equation 2 of 3FGL paper) for PL(Super)ExpCutoff, in MeV. NULL for other spectral types.
1 sigma error on cutoff energy for PLExpCutoff, in MeV. NULL for other spectral types.
Exponential index (b of Equation 2 of 3FGL paper) for PLSuperExpCutoff. NULL for other spectral types
Best-fit power-law index. Equal to Spectral_Index if SpectrumType is PowerLaw.
Integral flux from 30 to 100 MeV (not filled)
1 sigma error on integral flux from 30 to 100 MeV (not filled)
Spectral energy distribution between 30 and 100 MeV (not filled)
Square root of the TS between 30 and 100 MeV (not filled)
Integral flux from 100 to 300 MeV, in cm^-2 s^-1
1 sigma error on integral flux from 100 to 300 MeV, in cm^-2 s^-1
Spectral energy distribution between 100 and 300 MeV, in erg cm^-2 s^-1
Square root of the TS between 100 to 300 MeV
Integral flux from 100 to 300 MeV, in cm^-2 s^-1
1 sigma error on integral flux from 300 MeV to 1 GeV, in cm^-2 s^-1
Spectral energy distribution between 300 and 1 GeV, in erg cm^-2 s^-1
Square root of the TS between 300 MeV to 1 GeV
Integral flux from 1 to 3 GeV, in cm^-2 s^-1
1 sigma error on integral flux from 1 to 3 GeV, in cm^-2 s^-1
Spectral energy distribution between 1 and 3 GeV, in erg cm^-2 s^-1
Square root of the TS between 1 to 3 GeV
Integral flux from 3 to 10 GeV, in cm^-2 s^-1
1 sigma error on integral flux from 3 to 10 GeV, in cm^-2 s^-1
Spectral energy distribution between 3 and 10 GeV, in erg cm^-2 s^-1
Square root of the TS between 3 to 10 GeV
Integral flux from 10 to 100 GeV, in cm^-2 s^-1
1 sigma error on integral flux from 10 to 100 GeV, in cm^-2 s^-1
Spectral energy distribution between 10 and 100 GeV, in erg cm^-2 s^-1
Square root of the TS between 10 to 100 GeV
Sum of 2xLog(Likelihood) comparison between the flux fitted in 48 time segments and the average flux over the full catalog interval. A value greater than 72.44 over 48 intervals indicates < 1% chance of being a steady source.
Source significance in peak interval in sigma units
Peak integral flux from 100 MeV to 100 GeV, in cm^-2 s^-1
1 sigma error on peak integral flux, in cm^-2 s^-1
Time of center of interval in which peak flux was measured, in MET s
Length of interval in which peak flux was measured
Integral flux from 100 MeV to 100 GeV in time interval 1 ... 48, in cm^-2 s^-1
Error on the integral flux from 100 MeV to 100 GeV in time interval 1 ... 48, in cm^-2 s^-1, using the method indicated in Unc_Flag_History column and added in quatrature with 3% systematic component.
1 if it is half of the difference between the 2 sigma upper limit and the maximum likelihood value given in Flux_History; 0 if it is the 1 sigma uncertainty derived from a significant detection in the interval.
Cross-reference to the ExtendedSources extension for extended sources, if any.
Name of the corresponding 0FGL source, if any.
Name of the corresponding 1FGL source, if any.
Name of the corresponding 2FGL source, if any.
Name of the corresponding 1FHL source, if any.
Identification or positional associations with AGILE (1AGL)source
Identification or positional associations with 3EG source
Identification or positional associations with EGR source
Positional association with a TeVCat source, P for angular size < 40', E for extended, N if no TeV association
Name of likely corresponding TeV source from TevCat.
Class designation for most likely association. Capital letters indicate firm identifications; lower-case letters indicate associations: Pulsar, identified by pulsations (PSR), Pulsar, no pulsations seen in LAT yet (psr), Pulsar wind nebula (PWN), Supernova remnant (SNR), Supernova remnant/pulsar wind nebula (spp), Globular cluster (glc), High-mass binary (HMB), Binary (BIN), Nova (NOV), Star-forming region (SFR), Compact Steep Spectrum Quasar (css), Blazar of the BL Lac type (BLL), Blazar of the FSRQ type (FSRQ), Non-blazar active galaxy (AGN), Radio galaxy (RDG), Seyfert galaxy (SEY), Blazar candidate of uncertain type (BCU), Normal galaxy (GAL), Starburst galaxy (sbg), Narrow line Seyfert 1 (NLSY1), Soft spectrum radio quasar (ssrq), Unassociated source ( ).
2nd class designation for associated source.
Name of identified or likely associated source.
Alternate name of identified or likely associated source.
Binary coding. See Table 3 of 3FGL paper for the definition of the various Analysis Flags.
http://fermi.gsfc.nasa.gov/ssc/data/access/lat/4yr_catalog/
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