Description Usage Format Details Fields Source
Fermi Large Area Telescope Second Source Catalog (2FGL). Nolan, P. L. et al., The Astrophysical Journal Supplement Series, 199, 31 (2012).
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A data frame with 137 variables on 1873 gamma-ray sources.
Initial Release: 11 July 2011 Latest Release: gll_psc_v09.fit (18 May 2015)
2FGL 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
Significance derived from likelihood TS for 100 MeV\342\200\223100 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)
Curvature parameter (Beta) for LogParabola. NULL for other spectral types
1 sigma error on Beta for LogParabola. NULL for other spectral types
Cutoff energy as exp(-E/Cutoff) for PLExpCutoff, in MeV. NULL for other spectral types.
1 sigma error on cutoff energy for PLExpCutoff, in MeV. 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)
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
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
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
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
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
Square root of the TS between 10 to 100 GeV
Sum of 2xLog(Likelihood) comparison between the flux fitted in 24 time segments and a flat light curve over the full two-year catalog interval. A value greater than 41.64 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
Length of interval in which peak flux was measured
Integral flux from 100 MeV to 100 GeV in time interval 1 ... 24, in cm^-2 s^-1
Error on the integral flux from 100 MeV to 100 GeV in time interval 1 ... 24, 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.
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), Nova (NOV), Blazar of the BL Lac type (BZB), Blazar of the FSRQ type (BZQ), Non-blazar active galaxy (AGN), Radio galaxy (RDG), Seyfert galaxy (SEY), Active galaxy of uncertain type (AGU), Normal galaxy (GAL), Starburst galaxy (sbg), 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 2FGL paper for the definition of the various Analysis Flags.
http://fermi.gsfc.nasa.gov/ssc/data/access/lat/2yr_catalog/
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