Observational Search for PeV-EeV Tau Neutrino from GRB081203A
  We report the first observational search for tau neutrinos from gamma ray bursts (GRBs) using one of the Ashra light collectors. The earth-skimming tau-neutrino technique of imaging Cherenkov tau showers was applied as a detection method. We set stringent upper limits on the tau-neutrino fluence in PeV-EeV region for 3780 s (between 2.83 and 1.78 hours before) and another 3780 s (between 21.2 and 22.2 hours after) surrounding GRB081203A triggered by the Swift satellite. This first search for PeV-EeV tau neutrino complements other experiments in energy range and methodology, and suggests the prologue of "multi-particle astronomy" with a precise determination of time and location. 
Y. Aita (1), T. Aoki (1), Y. Asaoka (1), T. Chonan (1), M. Jobashi   (1), M. Masuda (1), Y. Morimoto (1), K. Noda (1), M. Sa...
astro-ph.HE