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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 231 (1995), S. 81-84 
    ISSN: 1572-946X
    Keywords: Soft gamma repeaters ; Lognormal statistics ; Monte Carlo methods ; Pulsars ; Glitches
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The time interval between successive bursts from SGR 1806-20 and the intensity of these bursts are both consistent with lognormal distributions. Monte Carlo simulations of lognormal burst models with a range of distribution parameters have been investigated. The main conclusions are that while most sources like SGR 1806-20 should be detected in a time interval of 25 years, sources with means about 100 times longer have a probability of about 5% of being detected in the same interval. A new breed of experiments that operate for long periods are required to search for sources with mean recurrence intervals much longer than SGR 1806-20.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Astrophysics and space science 231 (1995), S. 271-276 
    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
    Library Location Call Number Volume/Issue/Year Availability
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