The First Fermi Gamma-ray Burst Monitor (GBM) Terrestrial Gamma-ray Flash (TGF) Catalog

Wednesday, 17 December 2014
Michael S Briggs1, Valerie Connaughton2, Matthew Stanbro1, Binbin Zhang1, Narayana Bhat1, Gerald J Fishman1, Oliver Roberts3, Gerard Fitzpatrick3, Sheila McBreen3, J Eric Grove4 and Alexandre Chekhtman5, (1)University of Alabama in Huntsville, Huntsville, AL, United States, (2)Univ of AL in Huntsville, Huntsville, AL, United States, (3)University College Dublin, Dublin, Ireland, (4)Naval Research Lab DC, Washington, DC, United States, (5)George Mason University Fairfax, Fairfax, VA, United States
We present summary results from the first catalog of Terrestrial Gamma-ray Flashes (TGFs) detected with the Gamma-ray Burst Monitor (GBM) on the Fermi Space Telescope. The catalog is expected to contain about 2600 TGFs and will be released both online, to conveniently provide the community with TGF parameters, and as a publication. Since the launch of Fermi in 2008 the TGF detection sensitivity of GBM has been improved several times, both in the flight software and in ground analysis. Starting in 2010 July individual photons were downloaded for portions of the orbits, enabling an off-line search that found weaker and shorter TGFs. Since 2012 November 26 this telemetry mode has been extended to continuous coverage -- in the first year of this data mode 841 TGFs were detected. The TGF sample is reliable, with cosmic rays rejected using data both from Fermi GBM and from the Large Area Telescope on Fermi. The online catalog will include times (UTC and solar), spacecraft geographic positions, durations, count intensities and other parameters (e.g., see the Bayesian Block analysis by O. Roberts). There will be separate tables for bright TGFs detected by the flight software and Terrestrial Electron Beams (TEBs).