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  • 1
    Electronic Resource
    Electronic Resource
    Frequency of fast, narrow γ-ray bursts (1984)
    [s.l.] : Nature Publishing Group
    Nature 308 (1984), S. 434-435 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The ISEE-3 burst spectrometer7,8 trigger criterion differs from previous techniques in that the time for detecting a preset number of photons is accumulated ('time to spill'), rather than accumulating counts over a preset time interval. The photon counter setting and timing precision (clock ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/308434a0
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  • 2
    Electronic Resource
    Electronic Resource
    Reappearance of the annihilation line source at the Galactic Centre (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 36-38 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Previous measurements are summarized in Fig. 1 and reviewed in refs 7 and 8. The Ge instruments, which have a relatively narrow field of view (FOV), located the compact source to within ~8° of the GC during the 1970s. Positive satellite detections by the Solar Maximum Mission ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339036a0
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  • 3
    Electronic Resource
    Electronic Resource
    The origin of cosmic gamma-ray bursts : new Soviet results (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 361-361 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SINCE their accidental discovery in 1973 by Vela spacecraft, gamma-ray bursts have continued to be a mysterious and intriguing phenomenon. Lasting from a few seconds to a few tens of seconds, these bright flashes of gamma radiation occur randomly every one to two weeks. With one possible exception ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290361a0
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  • 4
    Electronic Resource
    Electronic Resource
    Search for γ-ray bursts with coincident balloon flights (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 694-696 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This experiment was designed to investigate the possibility that cosmic y-ray bursts could be detected in the size region of 10-7 to several times 10-6 erg cm-2, below the apparent bend in the size spectrum of Vela events as described by Strong and Klebesadel2. It has generally been assumed that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/266694a0
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  • 5
    Electronic Resource
    Electronic Resource
    Persistent X-ray emission from a γ -ray burst source (1982)
    [s.l.] : Nature Publishing Group
    Nature 300 (1982), S. 730-731 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The interplanetary burst network timing of y bursts has yielded several relatively precise error boxes for source locations. One of these, the 5 arcmin2 location1 of the y burst detected on 19 November 1978 (GBS0117-29) led to the discovery of its probable optical counterpart from a brief optical ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/300730a0
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  • 6
    Electronic Resource
    Electronic Resource
    Resolution of the 1,238-keV γ-ray line from supernova 1987A (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 122-123 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Instruments on satellites and high-altitude balloons have been tracking X- and y-ray emission from SN1987A since August 1987 (refs 5-12 and A.C. Rester et al.9 preprint). Line emission has been detected at 847 and l,238keV, as well as a hard continuum extending from 4 to 〉800keV (see ref. 13 for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339122a0
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  • 7
    Electronic Resource
    Electronic Resource
    High-resolution spectroscopy of gamma-ray bursts (1981)
    Springer
    Astrophysics and space science 75 (1981), S. 181-191 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on results from the Goddard germanium Gamma-Ray Burst Spectrometer flown on the ISEE-3 spacecraft. Spectral and temporal studies of two events on 4 and 19 November, 1978 are presented. The power law spectral indices were found to be respectively −1.82 and −1.31, the latter being the hardest event thus far detected. Evidence for two lines in the 4 November event is presented — a broad feature at ∼420 keV and a narrower one at 740 keV. These are consistent with a common redshift if the parent lines are assumed to be the positron annihilation line (511 keV) and the first excited state of iron (847 keV). If this interpretation is correct, it is shown that additional lines from higher levels of iron and possibly other nuclei are expected and that they may represent a significant contribution to the total spectrum above 1 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651394
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  • 8
    Electronic Resource
    Electronic Resource
    The energy spectra of gamma-ray bursts: old puzzles, recent analysis and new results (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 137-144 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Gamma-ray burst spectroscopy has at times been thought of as the key to understanding these mysterious events, and at others as a source of disappointment and confusion. Early spectral measurements contained evidence for cyclotron-line-like absorption and emission features. These results were the main anchor for the galactic neutron star paradigm for the origin of gamma-ray bursts. Ginga provided striking confirmation with evidence in three bursts for cyclotron absorption with both first and second harmonics present. The absorption line energies were consistent with the teragauss magnetic fields expected for neutron stars. The BATSE experiment on CGRO has dealt a severe blow to this paradigm. BATSE has found no evidence for the expected galactic anisotropy and also no evidence for cyclotron lines. The exact degree of inconsistency between BATSE and earlier GRB line results remains a complicated and unresolved question. In general, burst spectra display a wide variety of both spectral and temporal behavior. In essentially all bursts where spectral measurements are possible, the spectrum evolves during the burst. This spectral complexity and variability has presented researchers with a challenging task. At the present time, only the broadest correlations and characterizations are in hand. This paper will; 1) give a brief historical overview of GRB spectroscopic measurements and 2) provide a summary of the current observational situation with emphasis on the BATSE/Ginga controversy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658603
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  • 9
    Electronic Resource
    Electronic Resource
    The BATSE search for absorption lines (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 145-148 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract No absorption lines between 15 and 100 keV have been detected in burst spectra accumulated by BATSE. Almost 250 bursts have been inspected visually, and a computerized search has begun. Our simulations show that BATSE could indeed detect lines similar to those observed byGinga in strong bursts, and our tests of the detectors' actual capabilities demonstrate they function as understood. The apparent discrepancy between BATSE andGinga is not yet compelling, and therefore the BATSE nondetections do not invalidate theGinga detections. Nonetheless, the absence of BATSE line detections indicates a low line-occurrence frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658604
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  • 10
    Electronic Resource
    Electronic Resource
    The goddard program of gamma-ray transient astronomy (1981)
    Springer
    Astrophysics and space science 75 (1981), S. 93-108 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Goddard program of gamma-ray burst studies is briefly reviewed. The past results, present status and future expectations are outlined regarding our endeavors using experiments on balloons, IMP-6 and IMP-7, OGO-3, ISEE-1 and ISEE-3, Helios-2, Solar Maximum Mission, the Einstein Observatory, Solar Polar and the Gamma Ray Observatory, and with the interplanetary gamma-ray burst networks, to which some of these spacecraft sensors contribute. Additional emphasis is given to the recent discovery of a new type of gamma-ray transient, detected on 5 March, 1979.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651386
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