Background on Gamma Ray Radiation effects:

New Scientist on Radiation Roulette
USA Today story on Antimatter & Gamma Rays

Recent Events:

"Very High Energy Gamma Rays from the Vela Pulsar Direction'' (ApJ 487, L65), cited in: Australian Astronomical Society
AP News on Recent Bursts of GAmma RAys

Future?:

Reports are that Remote Viewing has foreseen massive Gamma Ray bombardment occurring in April 1999, with billions killed (interview on the Art Bell Show Oct. 1, 1998). Listen with a grain of salt, but watch for the possibility.