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 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.
For a full description of the catalog see the LAT 2FAV Catalog Paper draft on the arXiv.
The Second FAVA Catalog is available as a FITS file. Supporting files and associated products have been provided and are linked below.
|1||12 Dec 2016||2fav_v09.fits||Initial release (deprecated 2FAV ids).|
|2||18 Jul 2017||2fav_v10.fits||Official release.|