BATSE Observations of Gamma-Ray Burst Spectra. II. Peak Energy Evolution in Bright, Long Bursts
Astrophys.J. 439 (1995) 307 We investigate spectral evolution in 37 bright, long gamma-ray bursts observed with the BATSE Spectroscopy Detectors. High resolution spectra are characterized by the energy of the peak of \nfn~and the evolution of this quantity is examined relative to the emission intens...
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Zusammenfassung: | Astrophys.J. 439 (1995) 307 We investigate spectral evolution in 37 bright, long gamma-ray bursts
observed with the BATSE Spectroscopy Detectors. High resolution spectra are
characterized by the energy of the peak of \nfn~and the evolution of this
quantity is examined relative to the emission intensity. In most cases it is
found that this peak energy either rises with or slightly precedes major
intensity increases and softens for the remainder of the pulse. Inter-pulse
emission is generally harder early in the burst. For bursts with multiple
intensity pulses, later spikes tend to be softer than earlier ones indicating
that the energy of the peak of \nfn~is bounded by an envelope which decays with
time. Evidence is found that bursts in which the bulk of the flux comes well
after the event which triggers the instrument tend to show less peak energy
variability and are not as hard as several bursts in which the emission occurs
promptly after the trigger. Several recently proposed burst models are examined
in light of these results and no qualitative conflicts with the observations
presented here are found. |
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DOI: | 10.48550/arxiv.astro-ph/9407090 |