Statistics of faint gamma-ray bursts from the GRIF experiment on the Mir orbiting station

Kudryavtsev, M.I.; Svertilov, S.I.; Morozov, O.V.

Авторы: Kudryavtsev M.I., Svertilov S.I., Morozov O.V.
Журнал: Astronomy Letters
Том: 28
Номер: 5
Год издания: 2002
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 287
Последняя страница: 295
DOI: 10.1134/1.1476976
Аннотация: During the GRIF experiment onboard the Mir orbiting station, cosmic gamma-ray bursts (GRBs) were observed in the photon energy range 10-300 keV. We developed a technique for selecting events, cosmic GRB candidates, based on output readings from the PX-2 scintillation spectrometer, the main astrophysical instrument. Six events interpreted as cosmic GRBs were identified at a threshold sensitivity level of greater than or equal to 10(-7) erg cm(-2). The GRIF burst detection rate recalculated to all the sky is similar to10(3) yr(-1) (fluence greater than or equal to10(-7) erg cm(-2)). This rate matches the BATSE/CGRO estimate and significantly differs from the value predicted by the S(-3/2) dependence, which holds for a spatially uniform source distribution. The GRB detection rate at low peak fluxes is compared with the results of analysis for BATSE/CGRO "nontriggered" events and with predictions of major cosmological models. We conclude that the PX-2 observational data on faint cosmic GRBs are consistent with predictions of models with the highest frequency of GRB occurrence at z greater than or equal to 1.5-2. (C) 2002 MAIK "Nauka/lnterperiodica".
Добавил в систему: Свертилов Сергей Игоревич

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Statistics of faint gamma-ray bursts from the GRIF experiment on the Mir orbiting stationстатья