The $E_{p}$ Evolutionary Slope within the Decay Phase of "FRED" Gamma-ray Burst Pulses
TLDR
In this paper, Lu et al. investigated the evolutionary slope of the peak energy in the gamma-ray burst (GRB) spectrum with time during the pulse decay phase and found that the evolutionary slopes are normally distributed for both samples and concentrated around the values of 0.73 and 0.76 for Band and Compton models, respectively.Abstract:
Employing two samples containing of 56 and 59 well-separated FRED (fast rise and exponential decay) gamma-ray burst (GRB) pulses whose spectra are fitted by the Band spectrum and Compton model, respectively, we have investigated the evolutionary slope of $E_{p}$ (where $E_{p}$ is the peak energy in the $\nu F\nu$ spectrum) with time during the pulse decay phase. The bursts in the samples were observed by the Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory. We first test the $E_{p}$ evolutionary slope during the pulse decay phase predicted by Lu et al. (2007) based on the model of highly symmetric expanding fireballs in which the curvature effect of the expanding fireball surface is the key factor concerned. It is found that the evolutionary slopes are normally distributed for both samples and concentrated around the values of 0.73 and 0.76 for Band and Compton model, respectively, which is in good agreement with the theoretical expectation of Lu et al. (2007). However, the inconsistence with their results is that the intrinsic spectra of most of bursts may bear the Comptonized or thermal synchrotron spectrum, rather than the Band spectrum. The relationships between the evolutionary slope and the spectral parameters are also checked. We show the slope is correlated with $E_{p}$ of time-integrated spectra as well as the photon flux but anticorrelated with the lower energy index $\alpha$. In addition, a correlation between the slope and the intrinsic $E_{p}$ derived by using the pseudo-redshift is also identified. The mechanisms of these correlations are unclear currently and the theoretical interpretations are required.read more
Citations
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TL;DR: In this paper, the authors demonstrate that distinguishable gamma-ray burst (GRB) pulses exhibit similar behaviors as evidenced by correlations among the observable pulse properties of duration, peak luminosity, fluence, spectral hardness, energy-dependent lag, and asymmetry.
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Jet precession driven by neutrino-cooled disk for gamma-ray bursts
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Unification of Pulses in Long and Short Gamma-Ray Bursts: Evidence from Pulse Properties and their Correlations
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TL;DR: In this paper, the authors demonstrate that distinguishable gamma-ray burst pulses exhibit similar behaviors as evidenced by correlations among the observable pulse properties of duration, peak luminosity, fluence, spectral hardness, energy-dependent lag, and asymmetry.
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The $E_{\rm p}$-Flux Correlation in the Rising and Decaying Phases of Gamma-Ray Burst Pulses: Evidence for Viewing Angle Effect?
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TL;DR: In this paper, a time-resolved spectral analysis for a sample of 22 intense, broad GRB pulses from the BATSE GRB sample is presented, where the authors fit the spectra with the Band function and investigate the correlation between the observed flux (F) and the peak energy (E_p) of the $
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References
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TL;DR: In this paper, the authors studied the time-averaged gamma-ray burst spectra accumulated by the spectroscopy detectors of the Burst and Transient Source Experiment (BTSE).
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Intrinsic spectra and energetics of BeppoSAX Gamma-Ray Bursts with known redshifts
Lorenzo Amati,Filippo Frontera,Marco Tavani,J. J. M. in 't Zand,A. Antonelli,Enrico Costa,Marco Feroci,C. Guidorzi,John Heise,N. Masetti,Enrico Montanari,Luciano Nicastro,Eliana Palazzi,Elena Pian,Luigi Piro,Paolo Soffitta +15 more
TL;DR: In this paper, the spectral and energy properties of 12 gamma-ray bursts with redshift estimates were investigated and a positive correlation between the estimated total (isotropic) energies in the 1-10 000 keV energy range (Erad) and redshifts z was found.
Journal ArticleDOI
Gamma-Ray Burst Formation Rate Inferred from the Spectral Peak Energy-Peak Luminosity Relation
Daisuke Yonetoku,Toshio Murakami,Nakamura Tetsuhisa,Ryo Yamazaki,Akio K. Inoue,Kunihito Ioka +5 more
TL;DR: In this paper, the spectral peak energy (Ep) and peak luminosity were derived by combining the data of Ep and the peak luminosities by BeppoSAX and BATSE and derived a GRB formation rate as a function of the redshift.