%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%% OVERVIEW %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 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' (Fermi). 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 bin 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. For the flares, this catalog provides, together with the time and location information, the parameters of power-law fits to the source spectra in the two energy bands. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% 2FAV SOURCES column description %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% ID = Name of the 2FAV source, constructed as 2FAV JHHMM+DD.d[f] where HHMM expresses the Right Ascension (J2000) of the source in hours and minutes, and DD.d is the declination in degrees, truncated to the first decimal place. An 'f' is used to flag then source name in case it has been found significant by the photometric analysis, but not by the likelihood. The worst positional precision of the former suggest caution with this source. SRCNUM = Source number. It can be used to retrieve the flares associated with this source requesting: Flare['FAVASRC']==SRCNUM. RAJ2000 = Right Ascension (J2000) of the source in degrees DEJ2000 = Declination (J2000) of the source in degrees GLON = Galactic longitude of the source in degrees GLAT = Galactic latitude of the source in degrees FLARES = Total number of flares associated for the source (saturated flares are excluded) HEFLR = Number of high-energy (0.8-300 GeV) flares associated to the source (saturated flares are excluded) NEGFLR = Number of negative flares associated to the source (saturated flares are excluded) R95 = Estimate of the 95% containment radius. RS = Search radius used to look for counterparts. Defined as Rs=r99% + 0.1 deg (systematics) GAMMAASSOC = Likely gamma-ray counterpart (based on positional coincidence.). A '*' is added to the source name, if its variability index in the nFGL catalog is below the threshold to be considered variable at 99% probability. ASSOC = Likely counterpart at other wavelengths (as published in the considered catalogs) CLASS = Class of the likely counterpart. We use the 3FGL scheme for class names. ATEL = Number of Fermi-issued Astronomer's Telegram eventually associated with the source. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %% 2FAV FLARES column description %%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% FLARENUM= Flare number RAJ2000 = Right Ascension (J2000) of FAVA photometric position in degrees. DEJ2000 = Declination (J2000) of FAVA photometric position in degrees. GLON = Galactic longitude of FAVA photometric position in degrees. GLAT = Galactic latitude of FAVA photometric position in degrees. TSTART = Beginning of flare time window in MET seconds. TSTOP = End of flare time window in MET seconds. LESIGNIF= Photometric significance of flare at low energies (100-800 MeV). LEAVNEV = Expected number of events at low energies (100-800 MeV). LENEV = Observed number of events at low energies (100-800 MeV). HENEV = Observed number of events at high energies (0.8-300 GeV). HEAVNEV = Expected number of events at high energies (0.8-300 GeV). HESIGNIF= Photometric significance of flare at high energies (0.8-300 GeV). SUNDIST = Distance to the Sun of the photometric position of the flare, in degrees. FAVASRC = FAVA source number (SRCNUM) of the 2FAV source this flare is associated with. LETS = Flare TS at low energies (100-800 MeV). LETSRA = Right Ascension (J2000) of low-energy flare position from the TS map, in degrees. LETSDEC = Declination (J2000) of low-energy flare position from the TS map, in degrees. LETSGLON= Galactic longitude of low-energy flare position from the TS map, in degrees. LETSGLAT= Galactic latitude of low-energy flare position from the TS map, in degrees. LETS_R95= Average radius of the 95% confidence level contour of the low-energy TS map. LETS_SUN= Distance to the Sun of the low-energy flare position from the TS map, in degrees. LEFLUX = Integral flux of the flare between 100-800 MeV, in ph/cm^2/s. LEFLUXER= Error on LEFLUX in ph/cm^2/s. LEINDEX = Power-law index of the low-energy (100-800 MeV) spectra of the flare. LEINDEXER = Error on LEINDEX. HETS = Flare TS at high energies (0.8-300 GeV). HETSRA = Right Ascension (J2000) of high-energy flare position from the TS map, in degrees. HETSDEC = Declination (J2000) of high-energy flare position from the TS map, in degrees. HETSGLON= Galactic longitude of high-energy flare position from the TS map, in degrees. HETSGLAT= Galactic latitude of high-energy flare position from the TS map, in degrees. HETS_R95= Average radius of the 95% confidence level contour of the high-energy TS map. HETS_SUN= Distance to the Sun of the high-energy flare position from the TS map, in degrees. HE2LEDIS= Distance between the maxima of the high- and low-energy TS maps, in degrees. HEFLUX = Integral flux of the flare between 0.8-300 GeV, in ph/cm^2/s. HEFLUXER= Error in HEFLUX, in ph/cm^2/s. HEINDEX = Power-law index of the high-energy (0.8-300 GeV) spectra of the flare. HEINDEXER = Error on HEINDEX.