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  • 1
    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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Batse time-resolved observations of GRBs: the burst ‘topographic’ map (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 149-152 
    Details
    ISSN: 1572-946X
    Keywords: Gamma rays: bursts ; Methods: data analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is a well-known observation that many GRBs have spectra with curvature in the less than 1 MeV regime, but flatten out to approximately a -2 power law at higher energies. The large collecting area of BATSE allows spectral studies with unprecedented time resolution. We are conducting a systematic study of time-resolved spectroscopy of GRBs observed by BATSE. Several aspects of this survey are discussed: correlations among fit parameters and between fit parameters and intensity; screening for spectral features usingσ-residual contour maps; and an introduction to the GRB ‘topographic’ map and its possible qualitative diagnostic abilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658605
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The evaluation of BATSE line candidates (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 203-206 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We evaluated the significance of the line candidates identified by the visual search of burst spectra from BATSE's spectroscopy detectors. None of the candidates satisfy the detection criteria: anF-test probability less than 10−4 for a feature in one detector and consistency among the detectors which viewed the burst. Most of the candidates are not very significant, and are likely to be fluctuations. Because of the expectation of finding absorption lines, the search was biased towards absorption features. We do not have a quantitative measure of the completeness of the search which would form the basis of a comparison with previous missions. Therefore a more objective computerized search has begun.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658617
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    GRBs in the 5-10 keV regime as seen by BATSE (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 207-210 
    Details
    ISSN: 1572-946X
    Keywords: Gamma rays: bursts ; Methods: data analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The BATSE Spectroscopy Detectors (SDs) each have a thin beryllium window which allows detection of photons down to 5 keV. Until recently, exploitation of low-energy SD discriminator data has been held up by a lack of knowledge of its energy coverage. A recent series of in-flight changes in the instrument configuration has allowed the SD discriminators to be calibrated fairly accurately. With this in hand, we have surveyed BATSE GRBs for such features as X-ray precursors and after-glows in the roughly 5-10 keV band. For a large percentage of the BATSE bursts, no emission is observed in this energy band. In some cases where low-energy emission has been observed, ratios of flux histories indicate differential spectral evolution. In addition, we have obtained joint spectral fits between the low-energy data and the regular SD data, showing that a single spectral model is sometimes insufficient to fit the entire energy range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658618
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    Paper (German National Licenses)
    Fulltext
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