  The Antarctic Impulsive Transient Antenna (ANITA) is a balloon-borne radio
experiment designed to discover ultra-high energy cosmic neutrinos. The ANITA
detector has completed one prototype and two full-scale flights above the
Antarctic continent. Two direct and fourteen reflected cosmic ray events of
ultra-high energy were observed during the first full scale flight and several
others in the second flight. We present a Monte Carlo technique and analysis
developed to determine the energy of the primary cosmic ray particles from the
ANITA data.
