Review of GRANAT observations of gamma-ray bursts

O. Terekhov; D. Denissenko; R. Sunyaev; S. Sazonov; C. Barat; J. -P. Dezalay; G. Vedrenne; Niels Lund; A. J. Castro-Tirado; Søren Brandt

doi:10.1007/BF00658583

Review of GRANAT observations of gamma-ray bursts

O. Terekhov, D. Denissenko, R. Sunyaev, S. Sazonov, C. Barat, J. -P. Dezalay, G. Vedrenne, Niels Lund, A. J. Castro-Tirado, Søren Brandt

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Abstract

The GRANAT observatory was launched into a high apogee orbit on 1 December, 1989. Three instruments onboard GRANAT - PHEBUS, WATCH and SIGMA are able to detect gamma-ray bursts in a very broad energy range from 6 keV up to 100 MeV. Over 250 gamma-ray bursts were detected. We discuss the results of the observations of the time histories and spectral evolution of the detected events provided by the different instruments in different energy ranges. Short Gamma-Ray Bursts (<2 s) have 10 ms structure in their time histories. They have harder energy spectra than the long (> 2 s) events. Evidence of the existence of four differently behaving componenents in gamma-ray burst spectra is discussed. Statistical properties of the gamma-ray burst sources based on the 5 years of observations with (∼ 10−6 erg/cm2) sensitivity as well as the results of high sensitivity (∼ 10−8 erg/cm2) search for Gamma-Ray Bursts within the SIGMA telescope field of view are reviewed.

Original language	English
Journal	Astrophysics and Space Science
Volume	231
Issue number	1-2
Pages (from-to)	31-34
ISSN	0004-640X
DOIs	https://doi.org/10.1007/BF00658583
Publication status	Published - 1995

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@article{fadff713d85e4797b4da09566494342e,

title = "Review of GRANAT observations of gamma-ray bursts",

abstract = "The GRANAT observatory was launched into a high apogee orbit on 1 December, 1989. Three instruments onboard GRANAT - PHEBUS, WATCH and SIGMA are able to detect gamma-ray bursts in a very broad energy range from 6 keV up to 100 MeV. Over 250 gamma-ray bursts were detected. We discuss the results of the observations of the time histories and spectral evolution of the detected events provided by the different instruments in different energy ranges. Short Gamma-Ray Bursts (<2 s) have 10 ms structure in their time histories. They have harder energy spectra than the long (> 2 s) events. Evidence of the existence of four differently behaving componenents in gamma-ray burst spectra is discussed. Statistical properties of the gamma-ray burst sources based on the 5 years of observations with (∼ 10−6 erg/cm2) sensitivity as well as the results of high sensitivity (∼ 10−8 erg/cm2) search for Gamma-Ray Bursts within the SIGMA telescope field of view are reviewed.",

author = "O. Terekhov and D. Denissenko and R. Sunyaev and S. Sazonov and C. Barat and Dezalay, {J. -P.} and G. Vedrenne and Niels Lund and Castro-Tirado, {A. J.} and S{\o}ren Brandt",

year = "1995",

doi = "10.1007/BF00658583",

language = "English",

volume = "231",

pages = "31--34",

journal = "Astrophysics and Space Science",

issn = "0004-640X",

publisher = "Springer Netherlands",

number = "1-2",

}

TY - JOUR

T1 - Review of GRANAT observations of gamma-ray bursts

AU - Terekhov, O.

AU - Denissenko, D.

AU - Sunyaev, R.

AU - Sazonov, S.

AU - Barat, C.

AU - Dezalay, J. -P.

AU - Vedrenne, G.

AU - Lund, Niels

AU - Castro-Tirado, A. J.

AU - Brandt, Søren

PY - 1995

Y1 - 1995

N2 - The GRANAT observatory was launched into a high apogee orbit on 1 December, 1989. Three instruments onboard GRANAT - PHEBUS, WATCH and SIGMA are able to detect gamma-ray bursts in a very broad energy range from 6 keV up to 100 MeV. Over 250 gamma-ray bursts were detected. We discuss the results of the observations of the time histories and spectral evolution of the detected events provided by the different instruments in different energy ranges. Short Gamma-Ray Bursts (<2 s) have 10 ms structure in their time histories. They have harder energy spectra than the long (> 2 s) events. Evidence of the existence of four differently behaving componenents in gamma-ray burst spectra is discussed. Statistical properties of the gamma-ray burst sources based on the 5 years of observations with (∼ 10−6 erg/cm2) sensitivity as well as the results of high sensitivity (∼ 10−8 erg/cm2) search for Gamma-Ray Bursts within the SIGMA telescope field of view are reviewed.

AB - The GRANAT observatory was launched into a high apogee orbit on 1 December, 1989. Three instruments onboard GRANAT - PHEBUS, WATCH and SIGMA are able to detect gamma-ray bursts in a very broad energy range from 6 keV up to 100 MeV. Over 250 gamma-ray bursts were detected. We discuss the results of the observations of the time histories and spectral evolution of the detected events provided by the different instruments in different energy ranges. Short Gamma-Ray Bursts (<2 s) have 10 ms structure in their time histories. They have harder energy spectra than the long (> 2 s) events. Evidence of the existence of four differently behaving componenents in gamma-ray burst spectra is discussed. Statistical properties of the gamma-ray burst sources based on the 5 years of observations with (∼ 10−6 erg/cm2) sensitivity as well as the results of high sensitivity (∼ 10−8 erg/cm2) search for Gamma-Ray Bursts within the SIGMA telescope field of view are reviewed.

U2 - 10.1007/BF00658583

DO - 10.1007/BF00658583

M3 - Journal article

SN - 0004-640X

VL - 231

SP - 31

EP - 34

JO - Astrophysics and Space Science

JF - Astrophysics and Space Science

IS - 1-2

ER -

Review of GRANAT observations of gamma-ray bursts

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