The Ep,i–Eiso correlation: type I gamma-ray bursts and the new classification method

Minaev, P. Yu.; Pozanenko, A.

doi:10.1093/mnras/stz3611

Cited by 103 publications

(94 citation statements)

References 93 publications

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“…2 in Zhang et al 2007b). Additionally, using a completely new GRB sample, including 31 short and 252 long GRBs with wellmeasured peak energy and redshift, Zhang et al (2018a) found that short and long GRBs hold the coincident E p,i − E iso correlations, indicating that both kinds of GRBs may share the same radiation mechanism, which is consistent with the conclusion of Minaev & Pozanenko (2020). Consequently, we assume that Eq.…”

Section: Spectral Characteristics Of Diverse Prompt Emission Segmentssupporting

confidence: 77%

Overall Spectral Properties of Prompt Emissions with Diverse Segments in Swift/BAT Short Gamma-ray Bursts

Li,

Zhang,

Zhang

2021

Preprint

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Owing to lack of multiple components of prompt γ-ray emissions in short gamma-ray bursts (sGRBs), how these distinct components are correlated still keeps unclear. In this paper, we investigate the spectral and temporal properties of precursors, main peaks and extended emissions in 26 sGRBs including GRB 170817A. It is found that peak energies (E p ) in each pulse are uncorrelated with the pulse duration (t dur ). Meanwhile, we find that there is no obvious correlation between peak energy and energy fluence. Interestingly, there is no obvious spectral evolution from earlier precursors to later extended emissions in view of the correlations of t dur with either the E p or the low energy spectrum index, α. A power-law correlation between the average flux (F p ) and the energy fluence (S γ ), logF p = (0.62± 0.07)logS γ + (0.27± 0.07), is found to exist in the individual segments instead of mean peaks previously. Furthermore, we also find that the main peaks are on average brighter than the precursors or the extend emissions about one order of magnitude. On the basis of all the above analyses, one can conclude that three emissive components would share the same radiation mechanisms but they might be dominated by diverse physical processes.

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Section: Spectral Characteristics Of Diverse Prompt Emission Segmentssupporting

confidence: 77%

Overall Spectral Properties of Prompt Emissions with Diverse Segments in Swift/BAT Short Gamma-ray Bursts

Li,

Zhang,

Zhang

2021

Preprint

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“…Swift, and Fermi GRBs (Tarnopolski 2016b; Kwong & Nadarajah 2018;Minaev & Pozanenko 2020). This generally holds in higherdimensional parameter spaces as well (Tarnopolski 2019b,a,c).…”

Section: Introductionmentioning

confidence: 91%

How does the shape of gamma-ray bursts' pulses affect the duration distribution?

Tarnopolski

2021

Preprint

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Gamma-ray bursts (GRBs) come in two types, short and long. The distribution of logarithmic durations of long GRBs is asymmetric rather than Gaussian. Such an asymmetry, when modelled with a mixture of Gaussian distributions, requires an introduction of an additional component, often associated with another class of GRBs. However, when modelled with inherently asymmetric distributions, there is no need for such a component. The cosmological dilation was already ruled out as a source of the asymmetry, hence its origin resides in the progenitors. GRB light curves (LCs) are usually well described by a series of fast-riseexponential-decay pulses. A statistical analysis of ensembles of simulated LCs shows that the asymmetry is a natural consequence of the pulse shape and the multi-pulse character of the LCs.

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“…For GRBs with two or more flares, the sum of these flare energies is considered as the flare energy E flare , which can be obtained by E flare = 4πD 2 L S F /(1 + z), where D L and S F are the luminosity distance and the fluence of X-ray flares, respectively. Meanwhile, the corresponding E γ,iso can be obtained from Li Y et al (2016), Ruffini et al (2018), , Tang et al (2019), Fana Dirirsa et al (2019, Minaev & Pozanenko (2020), Hao et al (2020), andDu et al (2021). The X-ray flare data, including the redshift z, the isotropic energy of prompt emission E γ,iso , and the total flare energy E flare , are listed in Table 2.…”

Section: Datamentioning

confidence: 99%

Statistical analyses on the energies of X-ray plateaus and flares in gamma-ray bursts

Yi,

Du,

Liu

2021

Preprint

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Distinct X-ray plateau and flare phases have been observed in the afterglows of gamma-ray bursts (GRBs), and most of them should be related to central engine activities. In this paper, we collect 174 GRBs with X-ray plateau phases and 106 GRBs with X-ray flares. There are 51 GRBs that overlap in the two selected samples. We analyze the distributions of the proportions of the plateau energy E plateau and the flare energy E flare relative to the isotropic prompt emission energy E γ,iso . The results indicate that they well meet the Gaussian distributions and the medians of the logarithmic ratios are ∼ −0.96 and −1.39 in the two cases. Moreover, strong positive correlations between E plateau (or E flare ) and E γ,iso with slopes of ∼ 0.95 (or ∼ 0.80) are presented. For the overlapping sample, the slope is ∼ 0.80. We argue that most of X-ray plateaus and flares might have the same physical origin but appear with different features because of the different circumstances and radiation mechanisms. We also test the applicabilities of two models, i.e., black holes surrounded by fractured hyperaccretion disks and millisecond magnetars, on the origins of X-ray plateaus and flares.

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The Ep,i–Eiso correlation: type I gamma-ray bursts and the new classification method

Cited by 103 publications

References 93 publications

Overall Spectral Properties of Prompt Emissions with Diverse Segments in Swift/BAT Short Gamma-ray Bursts

Overall Spectral Properties of Prompt Emissions with Diverse Segments in Swift/BAT Short Gamma-ray Bursts

How does the shape of gamma-ray bursts' pulses affect the duration distribution?

Statistical analyses on the energies of X-ray plateaus and flares in gamma-ray bursts

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