ISSN:
1572-946X
Keywords:
Gamma rays:bursts
;
Gamma rays:high energy
;
Air showers
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract A small air shower array operating over many years has been used to search for ultra-high energy (UHE) gamma radiation (≥ 50 TeV) associated with gamma-ray bursts (GRBs) detected by the BATSE instrument on the Compton Gamma-Ray Observatory (CGRO). Upper limits for a one minute interval after each burst are presented for seven GRBs located with zenith anglesθ 〈 20°. A 4.3σ excess over background was observed between 10 and 20 minutes following the onset of a GRB on 11 May 1991. The confidence level that this is due to a real effect and not a background fluctuation is 99.8%. If this effect is real then cosmological models are excluded for this burst because of absorption of UHE gamma rays by the intergalactic radiation fields.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00658630
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