'I read Zhang's book with great interest, as I wanted an up-to-date review of the theories and the evidence for them. That is certainly what the book provides. It begins with clear reviews of GRB history and phenomenology. Then it reviews in considerable detail some generic (but highly non-trivial) high-energy astrophysics (relativity, relativistic shocks, leptonic and hadronic processes) … In conclusion, I found it an educational read …' Robert S. MacKay, Contemporary Physics