Size distribution of cosmic gamma-ray bursts

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Galactic Radiation, Gamma Rays, Spatial Distribution, Balloon Sounding, Balloon-Borne Instruments, Cosmic Rays, Intergalactic Media, Radiation Distribution, Scintillation Counters, Size Determination, Vela Satellites

Scientific paper

Combined results of three balloon-borne searches for small cosmic gamma-ray bursts are reported, and it is suggested that these results are incompatible with the extragalactic source postulated for the large events previously observed by satellites. Burst size is plotted against frequency for 23 Vela bursts and a balloon burst. The plots are shown to deviate from the -3/2-power law that should apply if the sources of gamma-ray bursts have a well-behaved distribution about a mean strength and are uniformly distributed in space. It is concluded that a uniform source distribution throughout space can be excluded with reasonable confidence, but a galactic-disk distribution cannot yet be confirmed.

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