An Intense Terrestrial Gamma-ray Flash Observed at Ground Level

J Eric Grove1, Bernard F. Phlips1, Eric A. Wulf1, Anthony L. Hutcheson1, Lee J. Mitchell1, Richard S. Woolf1, W. Neil Johnson1, Meagan Schaal1, Martin A Uman2, Douglas Jordan3, Brian Hare3, Hamid K Rassoul4 and Alan Bozarth5, (1)Naval Research Lab DC, Washington, DC, United States, (2)University of Florida, Gainesville, FL, United States, (3)Univ Florida, Gainesville, FL, United States, (4)Florida Institute of Technology, Department of Aerospace, Physics and Space Sciences, Melbourne, United States, (5)Florida Institute of Technology, Melbourne, FL, United States