Evolution of the Low-Energy Photon Spectra in Gamma-Ray Bursts

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dc.creatorCrider, A.
dc.creatorLiang, E. P.
dc.creatorSmith, I. A.
dc.creatorPreece, R. D.
dc.creatorBriggs, M. S.
dc.creatorPendleton, G. N.
dc.creatorPaciesas, W. S.
dc.creatorBand, D. L.
dc.creatorMatteson, J. L.
dc.date1996-12-11
dc.date.accessioned2026-07-07T02:22:33Z
dc.date.available2026-07-07T02:22:33Z
dc.descriptionWe report evidence that the asymptotic low-energy power law slope alpha (below the spectral break) of BATSE gamma-ray burst photon spectra evolves with time rather than remaining constant. We find a high degree of positive correlation exists between the time-resolved spectral break energy E_pk and alpha. In samples of 18 "hard-to-soft" and 12 "tracking" pulses, evolution of alpha was found to correlate with that of the spectral break energy E_pk at the 99.7% and 98% confidence levels respectively. We also find that in the flux rise phase of "hard-to-soft" pulses, the mean value of alpha is often positive and in some bursts the maximum value of alpha is consistent with a value > +1. BATSE burst 3B 910927, for example, has a alpha_max equal to 1.6 +/- 0.3. These findings challenge GRB spectral models in which alpha must be negative of remain constant.
dc.description12 pages (including 6 figures), accepted to ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/9612118
dc.identifierhttp://arxiv.org/abs/astro-ph/9612118
dc.identifierAstrophys.J. 479 (1997) 39
dc.identifierdoi:10.1086/310574
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/10914
dc.subjectAstrophysics
dc.titleEvolution of the Low-Energy Photon Spectra in Gamma-Ray Bursts
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