FERMI2FAVS ivo://nasa.heasarc/fermi2favs NASA/GSFC HEASARC Fermi FAVA Team 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The Fermi All-sky Variability Analysis (FAVA) is an analysis technique that searches for flaring sources in data collected by the Large Area Telescope (LAT) onboard NASA's Fermi Gamma-ray Space Telescope. It uses a photometric approach to blindly search for flares over the entire sky, and a likelihood analysis to precisely locate them and to measure their spectra. This catalog contains the flares and sources detected by running FAVA over the first 7.4 years of Fermi mission, from Modified Julian Date (MJD) 54682 (2008-08-04) to 57391 (2016-01-04). The analysis has been run in weekly time bins and in two independent energy bands, 100-800 MeV and 0.8-300 GeV. The detection threshold applied to the catalog flares is equivalent to 6 sigma (pre trials). The sources in the 2FAV are identified as clusters of flares. Their position and the corresponding error are derived from a weighted average of the best localized flares in the cluster. Likely gamma-ray counterparts, based on positional coincidence, are provided for the sources. This database table was first ingested by the HEASARC in July 2017 using electronic data obtained from the Fermi Science Support Center (FSSC). That data is available at <a href="http://fermi.gsfc.nasa.gov/ssc/data/access/lat/fava_catalog/">http://fermi.gsfc.nasa.gov/ssc/data/access/lat/fava_catalog/</a>. This is a service provided by NASA HEASARC . 2017ApJ...846...34A https://heasarc.gsfc.nasa.gov/W3Browse/all/fermi2favs.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=fermi2favs& GET text/xml 180 99999 true 143.13 -85.58 0.166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=fermi2favs GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_fermi2favs&Action=More+Options&Action=Parameter+Search&ConeAdd=1 FERMI 0.166666666666667 Gamma-ray public fermi2favs Fermi All-Sky Variability Analysis Second Catalog of Flaring Gam source_number Sequential Identification Number for Each Source in the Catalog meta.id;src int nullable 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 total_flares Total Number of Flares for the Source meta.number short nullable high_energy_flares Number of High-Energy (0.8-300 GeV) Flares for the Source meta.number short nullable negative_flares Number of Negative Flares for the Source meta.number short nullable error_radius 95% Containment Radius degree stat.error;pos double nullable gamma_ctrprt_name Likely Gamma-Ray Counterpart meta.id.assoc char nullable other_ctrprt_name Likely Counterpart at Other Wavelengths meta.id.assoc char nullable source_type Class of Likely Counterpart src.class char nullable lii Galactic Longitude degree pos.galactic.lon double nullable bii Galactic Latitude degree pos.galactic.lat double nullable gamma_ctrprt_var_flag Flag [Y/N] Indicates Variability Characterization of Gamma-Ray Counterpart meta.code;src.var char nullable search_radius Search Radius Used to Look for Counterparts degree pos double nullable telegram_number Number for Astronomers Telegram Alert Associated with the Source meta.ref int 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