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  • GRBs  (2)
  • ASTRONAUTICS (GENERAL)  (1)
  • Solid State Detectors  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Status of the Transient Gamma-Ray Spectrometer (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 475-478 
    Details
    ISSN: 1572-946X
    Keywords: GRBs ; High Resolution Spectroscopy ; Solid State Detectors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Transient Gamma-Ray Spectrometer (TGRS) was launched aboard the GGS/WIND spacecraft on November 1, 1994. After several deep space orbits (∼2 yrs) WIND will eventually be injected into a halo orbit around the Sun-EarthL 1 point. TGRS consists of a 215 cm3 high purityn-type Ge crystal which is kept at cryogenic temperatures by a passive radiative cooler. The energy range covered by the instrument is ∼25–8000 keV with an energy resolution of ∼2–3 keV. The primary task of TGRS is to perform high resolution spectroscopy of gamma-ray bursts and solar flares. Additional objectives are the study of transient x-ray pulsars and, using an on-board passive occulter, the long-term monitoring of sources such as the Crab and the Galactic Center. Since launch, TGRS has been performing exceedingly well, and all the important experiment parameters such as background levels, gain, and resolution have proven to be very stable. To date, TGRS has detected 27 GRBs and three solar flares. Preliminary analysis of our data also indicates that TGRS is indeed sensitive to sources such as the Crab and the Galactic Center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658674
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    First results from the TGRS high-resolution GRB Spectrometer (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 161-164 
    Details
    ISSN: 1572-946X
    Keywords: GRBs ; High resolution spectroscopy ; Solid state detectors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Transient Gamma Ray Spectrometer (TGRS) is a 215 cm3 passivelycooled germanium detector designed primarily to study spectral features of gamma ray bursts. Since shortly after its launch on 1994 Nov. 1 it has been producing high-resolution spectra of GRBs and solar flares. Some of these spectra are presented here. Although it has not yet detected any line features in GRBs-none were expected so early in the mission-several bursts have been seen simultaneously by TGRS, the Konus instruments on the same spacecraft, and the BATSE instrument on Compton GRO. A comparison of the spectra obtained by these various instruments, as presented here, may resolve the question of whether line features actually exist, and if so provide detailed spectroscopy to determine their physical origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658608
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    Paper (German National Licenses)
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  • 3
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    The Nuclear Astrophysics Explorer (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Nuclear Astrophysics Explorer was proposed in 1986 for NASA's Explorer Concept Study Program by an international collaboration of 25 scientists from nine institutions. The one-year feasibility study began in June 1988. The Nuclear Astrophysics Explorer would obtain high resolution observations of gamma-ray lines, E/Delta E about 1000, at a sensitivity of about 0.000003 ph/sq cm s, in order to study fundamental problems in astrophysics such as nucleosynthesis, supernovae, neutron star and black-hole physics, and particle acceleration and interactions. The instrument would operate from 15 keV to 10 Mev and use a heavily shielded array of nine cooled Ge spectrometers in a very low background configuration. Its 10 deg FWHM field of view would contain a versatile coded mask system which would provide two-dimensional imaging with 4 deg resolution, one-dimensional imaging with 2 deg resolution, and efficiendt measurements of diffuse emission. An unshielded Ge spectrometer would obtain wide-field measurements of transient gamma-ray sources. The earliest possible mission would begin in 1995.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 89-0414
    Format: text
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    NASA TECHNICAL REPORTS
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