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    Results of a Three Year Search for Bursts of High Energy Gamma Rays Using Widely Spaced Cosmic Ray Stations
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    Average cosmological invariant parameters (ACIPs) are calculated for six groups of BATSE cosmic gamma-ray bursts selected by their peak fluxes on the 1.024 s timescale. The ACIPs represent the average temporal and spectral properties of these events equally in the observer frame of reference and in the comoving frames of outbursting emitters. The parameters are determined separately for rise fronts and for back slopes of bursts, defined as the time profiles before and after the main peaks, respectively. The ACIPs for the rise fronts are found to be different for different intensity groups, while the ACIPs for the back slopes show no significant dependence on intensity. We conclude that emitters of bursts manifest standard average properties only during the back slopes of bursts.
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    A sensitive search for weak gamma‐ray bursts was conducted using data from two balloon flights. One burst was observed in 64 hours of observation. A 95% confidence upper limit to the burst rate is 2600 bursts/year with fluence greater than 4.4×10−7 ergs/cm2.
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