Recent experimental work with Peta-Watt lasers demonstrated efficient Snowplow and Wakefield accelerations of electrons and protons from a stationary target. Used laser beam had 1 micron wavelength at 540 - 560 Joule with a pulse duration of 500 - 1000 femto-seconds. The power of the photons reached 1020 W/cm2. GRB suggests far greater power at the source region, 1030 W/cm2, but the laser experiments illuminate high intensity photonic acceleration mechanisms. The imemdiate extrapolation of Snowplow/Wakefield acceleration to the very high gamma ray intensity from GRB's indicate that tyhe maximum acceleration energy of protons could be as high as 1024 eV in typical GRB events (e.g., GRB970508). Neutrino intensity on earth from these GRB acceleration is estimated at 1021 eV as 1 per km2 yr sr. Their interactions with anti-neutrinos in the halo of Virgo Cluster can produce protons and gamma rays above 1020 eV that reach earct at the rate of (0.1 - 1) per km2 century sr, without suffering from the propagation limit of the Greisen-Zatsepin-Kuzmin effect.
Fifth Huntsville Gamma Ray Burst Symposium
Hunsville, Alabama, USA
18-22 October, 1999