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Title:
BATSE observations of gamma-ray burst spectra. I - Spectral diversity
Authors:
Band, D.; Matteson, J.; Ford, L.; Schaefer, B.; Palmer, D.; Teegarden, B.; Cline, T.; Briggs, M.; Paciesas, W.; Pendleton, G.; Fishman, G.; Kouveliotou, C.; Meegan, C.; Wilson, R.; Lestrade, P.
Affiliation:
AA(California Univ., La Jolla), AB(California Univ., La Jolla), AC(California Univ., La Jolla), AD(NASA, Goddard Space Flight Center, Greenbelt, MD), AE(NASA, Goddard Space Flight Center, Greenbelt, MD), AF(NASA, Goddard Space Flight Center, Greenbelt, MD), AG(NASA, Goddard Space Flight Center, Greenbelt, MD), AH(Alabama Univ., Huntsville, AL), AI(Alabama Univ., Huntsville, AL), AJ(Alabama Univ., Huntsville, AL)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 1, p. 281-292. (ApJ Homepage)
Publication Date:
08/1993
Category:
Space Radiation
Origin:
STI
NASA/STI Keywords:
Galactic Halos, Gamma Ray Bursts, Gamma Ray Spectra, Statistical Analysis, Radiation Distribution, Transient Response
DOI:
10.1086/172995
Bibliographic Code:
1993ApJ...413..281B

Abstract

We studied the time-averaged gamma-ray burst spectra accumulated by the spectroscopy detectors of the Burst and Transient Source Experiment. The spectra are described well at low energy by a power-law continuum with an exponential cutoff and by a steeper power law at high energy. However, the spectral parameters vary from burst to burst with no universal values. The break in the spectrum ranges from below 100 keV to more than 1 MeV, but peaks below 200 keV with only a small fraction of the spectra breaking above 400 keV; it is therefore unlikely that a majority of the burst spectra are shaped directly by pair processes, unless bursts originate from a broad redshift range. The correlations among burst parameters do not fulfill the predictions of the cosmological models of burst origin. No correlations with burst morphology or the spatial distribution were found. We demonstrate the importance of using a complete spectral description even if a partial description (e.g., a model without a high-energy tail) is statistically satisfactory.

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