Cosmic rays and gamma radiation from the shell of SN1987A

Spark chamber measurements from a balloon gave a preliminary upper limit to the flux. The search for high-energy gamma rays is also possible using the ground-based Cerenkov-light detectors at Potchefstroom (S. Africa) and White Cliff station (Australia) for Esub(γ) >= 1 TeV, and by means of the extensive air shower array at Buckland Park (Australia) for Esub(γ) >= 106 GeV. Such observations can discover CR (cosmic rays) in the SN1987A shell if they are produced inside the shell with luminosity down to Lsub(p) approx. 1039 erg s-1. The authors argue that such measurements for SN1987 A will be possibe during the next 1-2 years, enough time to move Cerenkov detectors from the Northern to the Southern Hemisphere. (author)