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)

- Source_Name
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)

- RAJ2000
Right Ascension, J2000, deg, three decimal places

- DEJ2000
Declination, J2000, deg, three decimal places

- GLON
Galactic longitude, deg, three decimal places

- GLAT
Galactic latitude, deg, three decimal places

- Conf_68_SemiMajor
Semimajor radius of 68% confidence region, deg, three decimal places

- Conf_68_SemiMinor
Semiminor radius of 68% confidence region, deg, three decimal places

- Conf_68_PosAng
Position angle of 68% confidence region, deg. east of north, 0 decimal places

- Conf_95_SemiMajor
Semimajor radius of 95% confidence region, deg, three decimal places

- Conf_95_SemiMinor
Semiminor radius of 95% confidence region, deg, three decimal places

- Conf_95_PosAng
Position angle of 95% confidence region, deg. east of north, 0 decimal places

- ROI_num
ROI number (cross-reference to ROIs extension)

- Signif_Avg
Source significance (in sigma units) derived from likelihood TS for 100 MeV\342\200\223300 GeV analysis, one decimal place

- Pivot_Energy
Energy at which error on differential flux is minimal, in MeV

- Flux_density
Differential flux at Pivot_Energy, in cm^-2 MeV^-1 s^-1

- Unc_Flux_Density
1 sigma error on differential flux at Pivot_Energy, in cm^-2 MeV^-1 s^-1

- Spectral_Index
Best-fit photon number power-law index: For LogParabola spectra, index at Pivot_Energy; for PLExpCutoff spectra, low-energy index.

- Unc_Spectral_Index
1 sigma error on Spectral_Index

- Flux1000
Integral flux from 1 to 100 GeV, in cm^-2 s^-1

- Unc_Flux1000
1 sigma error on integral flux from 1 to 100 GeV, in cm^-2 s^-1

- Energy_Flux100
Energy flux from 100 MeV to 100 GeV obtained by spectral fitting, in erg cm^-2 s^-1

- Unc_Energy_Flux
1 sigma error on energy flux from 100 MeV to 100 GeV, in erg cm^-2 s^-1

- Signif_Curve
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.

- SpectrumType
Spectral type (PowerLaw, LogParabola, PLExpCutoff, PLSuperExpCutoff)

- beta
Curvature parameter (Beta) for LogParabola. NULL for other spectral types

- Unc_beta
1 sigma error on Beta for LogParabola. NULL for other spectral types

- Cutoff
Cutoff energy (E_c for equation 2 of 3FGL paper) for PL(Super)ExpCutoff, in MeV. NULL for other spectral types.

- Unc_Cutoff
1 sigma error on cutoff energy for PLExpCutoff, in MeV. NULL for other spectral types.

- Exp_Index
Exponential index (b of Equation 2 of 3FGL paper) for PLSuperExpCutoff. NULL for other spectral types

- PowerLaw_Index
Best-fit power-law index. Equal to Spectral_Index if SpectrumType is PowerLaw.

- Flux30_100
Integral flux from 30 to 100 MeV (not filled)

- Unc_Flux30_100
1 sigma error on integral flux from 30 to 100 MeV (not filled)

- nuFnu30_100
Spectral energy distribution between 30 and 100 MeV (not filled)

- Sqrt_TS30_100
Square root of the TS between 30 and 100 MeV (not filled)

- Flux100_300
Integral flux from 100 to 300 MeV, in cm^-2 s^-1

- Unc_Flux100_300
1 sigma error on integral flux from 100 to 300 MeV, in cm^-2 s^-1

- nuFnu100_300
Spectral energy distribution between 100 and 300 MeV, in erg cm^-2 s^-1

- Sqrt_TS100_300
Square root of the TS between 100 to 300 MeV

- Flux300_1000
Integral flux from 100 to 300 MeV, in cm^-2 s^-1

- Unc_Flux300_1000
1 sigma error on integral flux from 300 MeV to 1 GeV, in cm^-2 s^-1

- nuFnu300_1000
Spectral energy distribution between 300 and 1 GeV, in erg cm^-2 s^-1

- Sqrt_TS300_1000
Square root of the TS between 300 MeV to 1 GeV

- Flux1000_3000
Integral flux from 1 to 3 GeV, in cm^-2 s^-1

- Unc_Flux1000_3000
1 sigma error on integral flux from 1 to 3 GeV, in cm^-2 s^-1

- nuFnu1000_3000
Spectral energy distribution between 1 and 3 GeV, in erg cm^-2 s^-1

- Sqrt_TS1000_3000
Square root of the TS between 1 to 3 GeV

- Flux3000_10000
Integral flux from 3 to 10 GeV, in cm^-2 s^-1

- Unc_Flux3000_10000
1 sigma error on integral flux from 3 to 10 GeV, in cm^-2 s^-1

- nuFnu3000_10000
Spectral energy distribution between 3 and 10 GeV, in erg cm^-2 s^-1

- Sqrt_TS3000_10000
Square root of the TS between 3 to 10 GeV

- Flux10000_100000
Integral flux from 10 to 100 GeV, in cm^-2 s^-1

- Unc_Flux10000_100000
1 sigma error on integral flux from 10 to 100 GeV, in cm^-2 s^-1

- nuFnu10000_100000
Spectral energy distribution between 10 and 100 GeV, in erg cm^-2 s^-1

- Sqrt_TS10000_100000
Square root of the TS between 10 to 100 GeV

- Variability_Index
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.

- Signif_Peak
Source significance in peak interval in sigma units

- Flux_Peak
Peak integral flux from 100 MeV to 100 GeV, in cm^-2 s^-1

- Unc_Flux_Peak
1 sigma error on peak integral flux, in cm^-2 s^-1

- Time_Peak
Time of center of interval in which peak flux was measured, in MET s

- Peak_Interval
Length of interval in which peak flux was measured

- Flux_History.1 ... Flux_History.48
Integral flux from 100 MeV to 100 GeV in time interval 1 ... 48, in cm^-2 s^-1

- Unc_Flux_History.1 ... Unc_Flux_History.48
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.

- Unc_Flag_History.1 ... Unc_Flag_History.48
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.

- Extended_Source_Name
Cross-reference to the ExtendedSources extension for extended sources, if any.

- X0FGL_Name
Name of the corresponding 0FGL source, if any.

- X1FGL Name
Name of the corresponding 1FGL source, if any.

- X2FGL Name
Name of the corresponding 2FGL source, if any.

- X1FHL Name
Name of the corresponding 1FHL source, if any.

- ASSOC_GAM1
Identification or positional associations with AGILE (1AGL)source

- ASSOC_GAM2
Identification or positional associations with 3EG source

- ASSOC_GAM3
Identification or positional associations with EGR source

- TEVCAT_FLAG
Positional association with a TeVCat source, P for angular size < 40', E for extended, N if no TeV association

- ASSOC_TEV
Name of likely corresponding TeV source from TevCat.

- CLASS1
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 ( ).

- CLASS2
2nd class designation for associated source.

- ASSOC1
Name of identified or likely associated source.

- ASSOC2
Alternate name of identified or likely associated source.

- Flags
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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