FERMILGRB ivo://nasa.heasarc/fermilgrb NASA/GSFC HEASARC Fermi LAT Team 2026-10-02 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov GRB The LAT routinely observes high-energy emission from gamma-ray bursts (GRBs). Here we present the second catalog of LAT-detected GRBs. Initially, the second catalog covered the only the first 10 years of operations, from 2008 August 4 to 2018 August 4. The table given here has been supplemented to add later GRBs that were analyzed using the same procedure as the original catalog. It will be updated periodically with new GRBs. This database table was last updated by the HEASARC in April 2022 using electronic data obtained from the Fermi Science Support Center (FSSC). This is a service provided by NASA HEASARC . 2019ApJ...878...52A https://heasarc.gsfc.nasa.gov/W3Browse/all/fermilgrb.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=fermilgrb& GET text/xml 180 99999 true 356.52 -79.92 1 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=fermilgrb GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_fermilgrb&Action=More+Options&Action=Parameter+Search&ConeAdd=1 FERMI 1 Gamma-ray public fermilgrb Fermi LAT Second Gamma-Ray Burst Catalog name Designation of the GRB in yymmddfff Format meta.id;meta.main char nullable "time" Date/Time of the Trigger mjd time.start;obs double nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable error_radius Localization Error from LAT Transient Factory Analysis degree stat.error;pos double nullable lle_bbbd_sig Significance in LAT Low Energy (LLE) Data Using Bayesian Blocks Burst Detection sigma stat.fit.goodness;instr.background double nullable lle_t90 LLE Duration Time s time.duration double nullable tl100 LAT Emission Estimated Duration s time.duration double nullable like_best_ts Value of the Test Statistics That Returned the Highest Value of Test Statistics stat.likelihood double nullable lat_bpl_index1_error Error on the First Index of the Broken Power Law Model stat.error;stat.fit.param double nullable late_index Index That Best Describe the Behavior at Late Time (BPL or SPL Index1) stat.fit.param double nullable like_lat_t0 Start of the Time Window in the LAT Time Window s time.start double nullable irfs Instrument Response Function Used in the Analysis instr.calib;meta.file char nullable like_ext_grbindex Photon Index of the Power Law Model in the Ext Time Window stat.fit.param double nullable like_lat_flux_ene_error Error on the Energy Flux in the LAT Time Window erg/cm^2/s stat.error;phys.flux.energy;em.gamma double nullable ext_emission_n Number of Events with Probability >90% Associated with the GRB meta.number double nullable like_lat_eiso_rf Rest Frame Isotropic Energy from 0.1-10 GeV in the LAT Time Window erg em.energy double nullable like_ext_fluence Energy Fluence in the Ext Time Window erg/cm^2 phot.fluence;em.gamma double nullable lat_bpl_index2_error Error on the Second Index of the Broken Power Law Model stat.error;stat.fit.param double nullable like_lat_fluence Energy Fluence in the LAT Time Window erg/cm^2 phot.fluence;em.gamma double nullable tl100_error Error on the LAT Emission Duration s stat.error;time.duration double nullable like_lat_flux Flux in the LAT Time Window photon/cm^2/s phot.flux;em.gamma double nullable like_best_t1 End of the Time Window That Returned the Highest Value of Test Statistics s time.end double nullable like_gbm_eiso_rf Rest Frame Isotropic Energy from 0.1-10 GeV in the GBM Time Window erg em.energy double nullable late_index_error Error on the Index That Best Describe the Behavior at Late Time stat.error;stat.fit.param double nullable like_gbm_t1 End of the Time Window in the GBM Time Window s time.end double nullable ext_emission_max_ene_t Arrival Time of the Event with Maximum Energy s time.epoch double nullable lat_spl_chi2 Chi^2 Obtained By Fitting the LAT Light Curve with a Simple Power Law Model stat.fit.chi2 double nullable like_best_fluence_error Error on the Energy Fluence That Returned the Highest Value of Test Statistics erg/cm^2 stat.error;phot.flux;em.gamma double nullable like_ext_ts Value of the Test Statistics in the Ext Time Window stat.likelihood double nullable trigger_met Date/Time of the Trigger in Fermi Mission Elapsed Time s time.start;obs double nullable like_lat_fluence_error Error on the Energy Fluence in the LAT Time Window erg/cm^2 stat.error;phot.flux;em.gamma double nullable like_gbm_eiso_rf_error Error on the Rest Frame Isotropic Energy from 0.1-10 GeV in the GBM Time Window erg stat.error;em.energy double nullable lat_f0_error Error on the Normalization of the Simple Power Law Model stat.error;stat.fit.param double nullable gbm_cat_t90_error Error on the GBM T90 from the Fermi GBM GRB Catalog s stat.error;time.interval double nullable lat_f0 Normalization of the Simple Power Law Model stat.fit.param double nullable lat_bpl_f0 Normalization of the Broken Power Law Model stat.fit.param double nullable like_ext_t1 End of the Time Window in the Ext Time Window s time.end double nullable lat_bpl_timebreak_error Error on the Time of the Break s stat.error;stat.fit.param double nullable redshift Redshift of the GRB (If Available) src.redshift double nullable like_ext_eiso_rf_error Error on the Rest Frame Isotropic Energy from 0.1-10 GeV in the Ext Time Window erg stat.error;em.energy double nullable like_gbm_flux_error Error on the Flux in the GBM Time Window photon/cm^2/s stat.error;phot.flux;em.gamma double nullable like_ext_t0 Start of the Time Window in the Ext Time Window s time.start double nullable like_lat_flux_ene Energy Flux in the LAT Time Window erg/cm^2/s phys.flux.energy;em.gamma double nullable like_best_flux Flux That Returned the Highest Value of Test Statistics photon/cm^2/s phot.flux;em.gamma double nullable like_lat_grbindex Photon Index of the Power Law Model in the LAT Time Window stat.fit.param double nullable lat_bpl_index1 First Index of the Broken Power Law Model stat.fit.param double nullable like_ext_flux_ene_error Error on the Energy Flux in the Ext Time Window erg/cm^2/s stat.error;phys.flux.energy;em.gamma double nullable gbm_cat_fluence Fluence in the 10 keV-1 MeV Energy Band, from the Fermi GBM GRB Catalog erg/cm^2 phot.fluence;em.gamma double nullable arr_flag Set to 1 If the GRB Triggered an Autonomous Repoint Request meta.code;obs short nullable theta Off-Axis Angle at the Time of the Trigger degree pos double nullable like_lat_ts Value of the Test Statistics in the LAT Time Window stat.likelihood double nullable like_best_eiso_rf_error Error on the Rest Frame Isotropic Energy from 0.1-10 GeV erg stat.error;em.energy double nullable like_lat_grbindex_error Error on the Photon Index of the Power Law Model in the LAT Time Window stat.error;stat.fit.param double nullable gbm_cat_name Designation of the GRB in the Fermi GBM GRB Catalog meta.id char nullable like_gbm_grbindex Photon Index of the Power Law Model in the GBM Time Window stat.fit.param double nullable like_gbm_flux Flux in the GBM Time Window photon/cm^2/s phot.flux;em.gamma double nullable luminosity_distance Luminosity Distance Calculated Using the Redshift of the GRB cm pos.distance double nullable ext_emission_max_ene_p Probability of the Event with Maximum Energy stat.probability double nullable lat_bpl_f0_error Error on the Normalization of the Broken Power Law Model stat.error;stat.fit.param double nullable lat_bpl_index2 Second Index of the Broken Power Law Model stat.fit.param double nullable like_ext_flux_error Error on the Flux in the Ext Time Window photon/cm^2/s stat.error;phot.flux;em.gamma double nullable like_lat_eiso_rf_error Error on the Rest Frame Isotropic Energy from 0.1-10 GeV in the LAT Time Window erg stat.error;em.energy double nullable like_best_grbindex_error Error on the Photon Index of the Power Law Model stat.error;stat.fit.param double nullable like_ext_flux_ene Energy Flux in the Ext Time Window erg/cm^2/s phys.flux.energy;em.gamma double nullable like_lat_t1 End of the Time Window in the LAT Time Window s time.end double nullable like_gbm_grbindex_error Error on the Photon Index of the Power Law Model in the GBM Time Window stat.error;stat.fit.param double nullable gbm_cat_t95 Calclated As gbm_cat_t05+gbm_cat_t05 s time.interval double nullable like_ext_fluence_error Error on the Energy Fluence in the Ext Time Window erg/cm^2 stat.error;phot.flux;em.gamma double nullable ext_emission_max_ene Maximum Energy of the Event with >90% Probability Associated with the GRB MeV em.energy double nullable like_best_flux_ene Energy Flux That Returned the Highest Value of Test Statistics erg/cm^2/s phys.flux.energy;em.gamma double nullable bii Galactic Latitude degree pos.galactic.lat double nullable like_gbm_fluence Energy Fluence in the GBM Time Window erg/cm^2 phot.fluence;em.gamma double nullable lat_bpl_chi2 Chi^2 Obtained By Fitting the LAT Light Curve with a Broken Power Law Model stat.fit.chi2 double nullable like_ext_eiso_rf Rest Frame Isotropic Energy from 0.1-10 GeV in the Ext Time Window erg em.energy double nullable like_best_grbindex Photon Index of the Power Law Model That Returned the Highest TS Value stat.fit.param double nullable lat_spl_index1 Index of the Simple Power Law Model stat.fit.param double nullable gbm_cat_t05 GBM T05, When Available or 0 s time.interval double nullable like_ext_grbindex_error Error on the Photon Index of the Power Law Model in the Ext Time Window stat.error;stat.fit.param double nullable like_ext_flux Flux in the Ext Time Window photon/cm^2/s phot.flux;em.gamma double nullable like_best_fluence Energy Fluence That Returned the Highest Value of Test Statistics erg/cm^2 phot.fluence;em.gamma double nullable lat_bpl_timebreak Time of the Break s stat.fit.param double nullable like_gbm_flux_ene_error Error on the Energy Flux in the GBM Time Window erg/cm^2/s stat.error;phys.flux.energy;em.gamma double nullable lat_spl_index1_error Error on the Index of the Simple Power Law Model stat.error;stat.fit.param double nullable tl1 LAT Emission Estimated End s time.end double nullable like_gbm_fluence_error Error on the Energy Fluence in the GBM Time Window erg/cm^2 stat.error;phot.flux;em.gamma double nullable gbm_cat_t90 GBM T90, When Available or the Estimated Duration of the Prompt Emission s time.interval double nullable tl0_lower Estimated Lower Limit on the LAT Emission Onset Time s time.start;stat.min double nullable tl1_upper Estimated Upper Limit on LAT Emission End s time.end;stat.max double nullable gbm_cat_fluence_error Error on the Fluence in the 10 KeV-1 MeV Energy Band erg/cm^2 stat.error;phot.flux;em.gamma double nullable lle_t05 LLE Onset Time s time.start double nullable like_gbm_flux_ene Energy Flux in the GBM Time Window erg/cm^2/s phys.flux.energy;em.gamma double nullable lle_t95 LLE End Time s time.end double nullable like_gbm_t0 Start of the Time Window in the GBM Time Window s time.start double nullable lii Galactic Longitude degree pos.galactic.lon double nullable like_best_eiso_rf Rest Frame Isotropic Energy from 0.1-10 GeV from 0.1-10 GeV erg em.energy double nullable like_best_t0 Start of the Time Window That Returned the Highest Value of Test Statistics s time.start double nullable tl0 LAT Emission Estimated Onset Time s time.start double nullable gcn_name Designation in the GCN Distribution List meta.id char nullable like_lat_flux_error Error on the Flux in the LAT Time Window photon/cm^2/s stat.error;phot.flux;em.gamma double nullable lle_bbbd_sig_detected Whether the GRB Is Detected in LLE Data meta.number short nullable like_best_flux_error Error on the Flux That Returned the Highest Value of Test Statistics photon/cm^2/s stat.error;phot.flux;em.gamma double nullable distance_to_closest Distance to the Closest 3FGL Source degree pos.angDistance double nullable like_best_flux_ene_error Error on the Energy Flux That Returned the Highest Value of Test Statistics erg/cm^2/s stat.error;phys.flux.energy;em.gamma double nullable like_gbm_ts Value of the Test Statistics in the GBM Time Window stat.likelihood double nullable zenith Zenith Angle at the Time of the Trigger degree pos double nullable su_tsinput Test Statistic Resulting from the LAT Transient Factory Detection Algorithm stat.likelihood double 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