München 1997 – wissenschaftliches Programm
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T: Teilchenphysik
T 509: Kosmische γ-Strahlung II
T 509.3: Vortrag
Donnerstag, 20. März 1997, 16:15–16:30, 219
Gamma-Ray Astronomy above 100 GeV: Some implications for Gamma-Ray Bursts — •B. Funk1, D. Hartmann2, H. Krawczynski3, K. Mannheim4, and H. Meyer1 — 1Universit"at Wuppertal, Fachbereich Physik, Gaußstr. 20, D-42097 Wuppertal — 2Dept. of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA — 3Universit"at Hamburg, Physik II, Luruper Chaussee 149, D-22761 Hamburg — 4Universitäts-Sternwarte, Geismarlandstrasse 11, D-37803 G"ottingen
High energy observations of gamma-ray bursts (GRBs) with the EGRET instrument aboard COMPTON Observatory suggest that most GRBs (or all) exhibit high energy spectral tails extending to ∼ 10 GeV. Additional support for the existence of such high energy tails was recently provided by the Tibet Extensive Air Shower (EAS) array, which reported 6-σ evidence for burst emission in the TeV energy range. These observations emphasize the importance of including current earth-bound experiments, operating between 500 GeV and 100 TeV, in ongoing discussions about the nature and origin of the GRB phenomenon. We present a method to use observed flux limits to constrain the physical parameter space of GRB emission models. We explicitly utilize the results of various EAS experiments as for example HEGRA to constrain an assumed power law slope (α) of the GRB photon spectrum in the TeV range. For strong bursts we can exclude slopes α ∼ 2.2 for GRBs closer than zGRB ≃0.1.