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High-Energy Astrophysics American and Soviet Perspectives/Proceedings from the U.S.-U.S.S.R. Workshop on High-Energy Astrophysics (1991) / Chapter Skim
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A STATISTICAL ANALYSIS OF GAMMA-RAY BURSTS DETECTED BY THE KONUS EXPERIMENT ON VENERA 11 and 12
Pages 329-335

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From page 329...
... We have applied the V/V, test to gamma-ray bursts of duration longer than 1 second recorded by the Konus experiment aboard Venera 11 and 11 Based on a sample of 123 bursts, we find < V/Vma c > = 0.46 ~ 0.03, consistent with a uniform distribution in space. We urge that experimenters give careful attention to the detection limit for each recorded gamma-ray burst, and that quantitative data for burst properties and detection limits be published.
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From page 330...
... These will unavoidably lead to a flattening of the size-frequency distnbution, even if the sources have a uniform space distribution The V/Vma~ test for uniformity of the space distribution takes into account the detection limit associated with each individual burst source. This test, which has several further advantages, is described below and then used on bursts recorded in the Konus expenment.
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From page 331...
... The limiting count Chin is usually set at a multiple of the noise associated with the background rate B In the Konus experiment, the noise is evaluated Tom a reference count that includes both background and some burst signal.
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From page 332...
... This applies to the two time integration bins Mat are employed in parallel in the Konus experiment. DERIVATION OF V/VMAX FROM THE KONUS DATA On Venera 11 and 12, each Konus detector system, covering the nominal energy band from 0.05 to 0.15 MeV, consists of six scintillator detectors aligned along the axes of a Cartesian coordinate system (Mazets and Golenetskii 1981~.
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From page 333...
... (2~. , , # ~, ~, For each of the tugger integration times T = 0.25 and 1.5 s, we so derive the amplitude reduction factor Rmin that will jUSt trigger burst detection 6~ of the background.
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From page 334...
... Therefore, the radial distribution of the Konus bursts gives us no clue to their distance scale. The application of the V/Vmaz test to gamma-ray bursts in this case is complex, because the Konus experiment produced digital time profiles, but triggered on exponential time-averaged counts produced by an analog circuit.
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From page 335...
... American Institute of Physics, New York Jennings, M.C 1988. Intrinsic and artificial bias in the Konus cumulative number distribution.
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Key Terms

  • konus experiment
  • space distribution
  • detection limit
  • count rates
  • peak count

  • cosmological distances
  • experiment aboard
  • burst detection
  • limiting count
  • burst signal

  • count rate
  • reduction factor
  • background rate
  • count coin
  • analog output

  • noise associated
  • burst recording
  • experiment data
  • factor rmin
  • bursts detected

  • detection requires
  • individual burst
  • recording trigger
  • pseudo background
  • time constants

  • detection threshold
  • versus log
  • aboard venera
  • parent population
  • integration time


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