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Spectral evolution of pulse structures in gamma-ray bursts
Norris, J. P.; Share, G. H.; Messina, D. C.; Dennis, B. R.; Desai, U. D.; Cline, T. L.; Matz, S. M.; Chupp, E. L.
AA(U.S. Navy, E.O. Hulburt Center for Space Research, Washington, DC), AB(U.S. Navy, E.O. Hulburt Center for Space Research, Washington, DC), AC(U.S. Navy, E.O. Hulburt Center for Space Research, Washington, DC), AD(NASA, Goddard Space Flight Center, Greenbelt, MD), AE(NASA, Goddard Space Flight Center, Greenbelt, MD), AF(NASA, Goddard Space Flight Center, Greenbelt, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 1, 1986, p. 213-219. (ApJ Homepage)
Publication Date:
Space Radiation
NASA/STI Keywords:
Gamma Ray Bursts, Gamma Ray Spectra, Pulse Duration, Solar Maximum Mission, Gamma Ray Spectrometers, Spectral Energy Distribution
Bibliographic Code:


The Hard X-Ray Burst Spectrometer (HXRBS) and Gamma-Ray Spectrometer (GRS) data from the Solar Maximum Mission satellite have been searched for gamma-ray bursts with sufficient intensities and relatively simple time profiles such that their spectral behavior may be studied on a time scale of about 1 s. Ten such events were observed with the GRS experiment, and four of these were also detected within the HXRBS field of view. Details are presented for two moderately intense bursts with relatively simple structure. The spectral evolutions of the remaining events are summarized briefly. Results suggest a pattern in the spectral evolution within burst pulses: a tendency for the high-energy emission to lead the low-energy emission, in contrast to the correlation of intensity and spectral hardness reported by Golenetskii et al. (1983).

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