A comprehensive statistical study on gamma-ray bursts

Wang, Feifei; Zou, Yuan-Chuan; Liu, Fuxiang; Liao, Bin; Liu, Yu; Chai, Yating; Xia, Lei

doi:10.48550/arxiv.1902.05489

Cited by 3 publications

(3 citation statements)

References 210 publications

(293 reference statements)

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“…Specifically, the elements of the correlation matrix from Table 3 (Bagoly et al 2003). Nowadays, the number of redshift measurements, among various satellites, is about 600 (Wang et al 2019).…”

Section: Datasets and Methodsmentioning

confidence: 99%

Multivariate Analysis of BATSE Gamma-Ray Burst Properties Using Skewed Distributions

Tarnopolski

2019

ApJ

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The number of classes of gamma-ray bursts (GRBs), besides the well-established short and long ones, remains a debatable issue. It was already shown, however, that when invoking skewed distributions, the log T 90 and log T 90 −log H 32 spaces are adequately modeled with mixtures of only two such components, implying two GRB types. Herein, a comprehensive multivariate analysis of several multi-dimensional parameter spaces is conducted for the BATSE sample of GRBs, with the usage of skewed distributions. It is found that the number of extracted components varies between the examined parameter sets, and ranges from 2 to 4, with higher-dimensional spaces allowing for more classes. A Monte Carlo testing implies that these additional components are likely to be artifacts owing to the finiteness of the data and be a result of examining a particular realization of the data as a random sample, resulting in spurious identifications.

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Section: Datasets and Methodsmentioning

confidence: 99%

Multivariate Analysis of BATSE Gamma-Ray Burst Properties Using Skewed Distributions

Tarnopolski

2019

ApJ

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“…Their analysis indicates L b,z ∝ T −0.9 b,z E 0.4 γ,iso and L b,z ∝ T −0.9 b,z E 0.5 p,i , where T b,z is the break time of the plateau phase in the optical band, L b,z is the corresponding optical luminosity during the plateau phase, and E p,i is the peak energy of the prompt emission. For a comprehensive overview of various GRB correlations, one may refer to Wang et al (2019).…”

Section: Introductionmentioning

confidence: 99%

Statistical Study of Gamma-Ray Bursts with a Plateau Phase in the X-Ray Afterglow

Tang

Huang

Geng

et al. 2019

ApJS

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A plateau phase in the X-ray afterglow is observed in a significant fraction of gamma-ray bursts (GRBs). Previously, it has been found that there exists a correlation among three key parameters concerning the plateau phase, i.e., the end time of the plateau phase in the GRB rest frame (T a ), the corresponding X-ray luminosity at the end time (L X ) and the isotropic energy of the prompt GRB (E γ,iso ). In this study, we systematically search through all the Swift GRBs with a plateau phase that occurred between 2005 May and 2018 August. We collect 174 GRBs, with redshifts available for all of them. For the whole sample, the correlation between L X , T a and E γ,iso is confirmed, with the best fit relation being L X ∝ T −0.92 a E 0.83 γ,iso . Such an updated three-parameter correlation still supports that the central leftover after GRBs is probably a millisecond magnetar. It is interesting to note that short GRBs with duration less than 2 s in our sample also follow the same correlation, which hints that the merger production of two neutron stars could be a high mass magnetar, but not necessarily a black hole. Moreover, GRBs having an "internal" plateau (i.e., with a following decay index being generally smaller than -3) also obey this correlation. It further strengthens the idea that the internal plateau is due to the delayed collapse of a high mass neutron star into a black hole. The updated three-parameter correlation indicates that GRBs with a plateau phase may act as a standard candle for cosmology study.

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“…We have used ΛCDM cosmology model with cosmological parameters, H 0 = 67.4 ± 0.5 km/s/Mpc, Λ vac = 0.685 and Λ m = 0.315 (Planck collaboration 2018, Aghanim et al 2018) for calculating the energetics of the GRB. Since there was no redshift available for GRB 160325A, we have assumed a redshift of z = 2, which is roughly the average redshift of long GRBs (Bagoly et al 2006;Wang et al 2019;Lloyd-Ronning et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Spectropolarimetric analysis of prompt emission of GRB 160325A: jet with evolving environment of internal shocks

Sharma

Iyyani

Bhattacharya

et al. 2020

Monthly Notices of the Royal Astronomical Society

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GRB 160325A is the only bright burst detected by AstroSat CZT Imager in its primary field of view to date. In this work, we present the spectral and polarimetric analysis of the prompt emission of the burst using AstroSat, Fermi and Niel Gehrels Swift observations. The prompt emission consists of two distinct emission episodes separated by a few seconds of quiescent/ mild activity period. The first emission episode shows a thermal component as well as a low polarisation fraction of PF < 37 % at 1.5 σ confidence level. On the other hand, the second emission episode shows a non-thermal spectrum and is found to be highly polarised with PF > 43 % at 1.5σ confidence level. We also study the afterglow properties of the jet using Swift/XRT data. The observed jet break suggests that the jet is pointed towards the observer and has an opening angle of 1.2 • for an assumed redshift, z = 2. With composite modelling of polarisation, spectrum of the prompt emission and the afterglow, we infer that the first episode of emission originates from the photosphere with localised dissipation happening below it, and the second from the optically thin region above the photosphere. The photospheric emission is generated mainly by inverse Compton scattering, whereas the emission in the optically thin region is produced by the synchrotron process. The low radiation efficiency of the burst suggests that the outflow remains baryonic dominated throughout the burst duration with only a subdominant Poynting flux component, and the kinetic energy of the jet is likely dissipated via internal shocks which evolves from an optically thick to optically thin environment within the jet.

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A comprehensive statistical study on gamma-ray bursts

Cited by 3 publications

References 210 publications

Multivariate Analysis of BATSE Gamma-Ray Burst Properties Using Skewed Distributions

Multivariate Analysis of BATSE Gamma-Ray Burst Properties Using Skewed Distributions

Statistical Study of Gamma-Ray Bursts with a Plateau Phase in the X-Ray Afterglow

Spectropolarimetric analysis of prompt emission of GRB 160325A: jet with evolving environment of internal shocks

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