目录 Preface 1 Introduction "The Last Electromagnetic Window" Energy Domains of Gamma Ray Astronomy Gamma Ray Astronomy: A Discipline in Its Own Right 2 Status of the Field 21 Low Energy Gamma Ray Sources 211 The COMPTEL source catalog 22 High Energy Gamma Ray Sources 221 GeV blazars 222 GeV pulsars 223 Unidentified EGRET sources 23 The Status of Ground-Based Gamma Ray Astronomy 231 Brief historical review 232 Reported TeV sources 2321 The Crab Nebula 2322 Other plerions 2323 Gamma ray pulsars 2324 Gamma rays from supernova remnants 2325 Other galactic sources 2326 TeV blazars 2327 Other extragalactic objects 233 Next generation of I ACT arrays ……