Contains results presented at the Sixth International Workshop on Data Analysis in Astronomy - "Modeling and Simulation in Science" held on April 15-22, 2007, at the Ettore Majorana Foundation and Center for Scientific Culture, Erice, Italy. This book focuses primarily on data analysis methodologies and techniques.

At ultra-high energy the radiation is produced by interactions of cosmic ray particles accelerated in explosive events such as supernovae or hypernovae, black holes or, possibly, the big bang. This work introduces young researchers to the field of ultra-high energy astrophysics including charged particles, gamma rays and neutrinos.