A Close Correlation between the Spectral Lags and Redshifts of Gamma-Ray Bursts

Yi, Ting-Feng; Xie, Gaogang; Zhang, Fu-Wen

doi:10.1088/1009-9271/8/1/08

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…The derived ρ 0 in the parameter set (κ L , κ θ ) = (−1.02, −1.42) is 1.52 × 10 2 Gpc −3 yr −1 . Some apparent correlations between some GRB properties and redshift were discussed by some authors with small samples, such as the redshift dependence of the spectral lag of GRBs in prompt phases (Yi et al 2008) and the duration of the shallow decay phase of GRB X-ray afterglows (Stratta et al 2009). Physically, these correlations may be results from the cosmic evolution of the explosion energy and/or the jet geometry (e.g., Xu et al 2005), if they are intrinsic.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Selection Effects on the Observed Redshift Dependence of Gamma-Ray Burst Jet Opening Angles

Wei

Qin

et al. 2012

ApJ

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Apparent redshift dependence of the jet opening angles (θ j ) of gamma-ray bursts (GRBs) is observed from current GRB sample. We investigate whether this dependence can be explained with instrumental selection effects and observational biases by a bootstrapping method. Assuming that (1) the GRB rate follows the star formation history and the cosmic metallicity history and (2) the intrinsic distributions of the jet-corrected luminosity (L γ ) and θ j are a Gaussian or a power-law function, we generate a mock Swift/BAT sample by considering various instrumental selection effects, including the flux threshold and the trigger probability of BAT, the probabilities of a GRB jet pointing to the instrument solid angle and the probability of redshift measurement. Our results well reproduce the observed θ j − z dependence. We find that in case of L γ ∝ θ 2 j good consistency between the mock and observed samples can be obtained, indicating that both L γ and θ j are degenerate for a flux-limited sample. The parameter set (L γ , θ j ) = (4.9 × 10 49 erg s −1 , 0.054rad) gives the best consistency for the current Swift GRB sample. Considering the beaming effect, the derived intrinsic local GRB rate accordingly is 2.85 × 10 2 Gpc −3 yr −1 , inferring that ∼ 0.59% of Type Ib/c SNe may be accompanied by a GRB.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Selection Effects on the Observed Redshift Dependence of Gamma-Ray Burst Jet Opening Angles

Wei

Qin

et al. 2012

ApJ

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“…In addition, the lags calculated with the cross-correlation function (CCF), CCF , have been widely adopted by many authors (Band 1997;Norris et al 2000;Wu & Fenimore 2000;Hakkila & Giblin 2004, 2006Chen et al 2005;Norris & Bonnell 2006;Yi et al 2006Yi et al , 2008Zhang et al 2006aZhang et al , 2006bZ07;Peng et al 2007;Hakkila et al 2007). In general, CCF can be calculated directly from the observed data.…”

Section: Spectral Lag and Energy Dependencementioning

confidence: 99%

Broadband Light Curve Characteristics of GRBs 980425 and 060218 and Comparison with Long‐Lag, Wide‐Pulse GRBs

Zhang

2008

Astrophysical Journal

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It has been recently argued that low-luminosity gamma-ray bursts (LL-GRBs) are likely a unique GRB population. Here, we present systematic analysis of the light-curve characteristics from X-ray to gamma-ray energy bands for the two prototypical LL-GRBs, 980425 and 060218. It is found that both the pulse width (w) and the ratio of the rising width to the decaying width (r/d ) of theses two bursts are energy-dependent over a broad energy band. There exists a significant trend that the pulses tend to be narrower and more symmetrical at higher energy bands for the two events. Both the X-rays and the gamma-rays follow the same w-E and r/d-E relations. These facts may indicate that the X-ray emission tracks the gamma-ray emission, and both are likely to originate from the same physical mechanism. Their light curves show significant spectral lags. We calculate the three types of lags with the pulse peaking time (t peak ), the pulse centroid time (t cen ), and the cross-correlation function (CCF). The derived t peak and t cen are power-law functions of energy. The lag calculated by CCF is strongly correlated with that derived from t peak . However, the lag derived from t cen correlates less with that derived from t peak and CCF. The energy dependence of the lags is shallower at higher energy bands. These characteristics are consistent with that observed in typical long-lag, wide-pulse GRBs, suggesting that GRBs 980425 and 060218 may share a similar radiation physics with them. Subject headingg s: gamma rays: bursts -methods: statistical -X-rays: individual (GRB 980425, GRB 060218)

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“…Using a mock sample and bootstrap technique, they showed that the observed jetrelation is most likely due to instrumental selection effects. Moreover, they argued that while other types of relation, for example, lag - [144] or the redshift dependence of the shallow decay in X-ray afterglows by Stratta et al [145], might have connections with the jet geometry, they are also likely to stem from observational biases or sample selection effects. Also, Ryan et al [146] investigated the jet-opening angle properties using a sample of 226 Swift/XRT GRBs with known redshift.…”

Section: Physicalmentioning

confidence: 99%

Gamma-Ray Burst Prompt Correlations

Dainotti

Vecchio

Tarnopolski

2018

Advances in Astronomy

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The mechanism responsible for the prompt emission of gamma-ray bursts (GRBs) is still a debated issue. The prompt phase-related GRB correlations can allow discriminating among the most plausible theoretical models explaining this emission. We present an overview of the observational two-parameter correlations, their physical interpretations, and their use as redshift estimators and possibly as cosmological tools. The nowadays challenge is to make GRBs, the farthest stellar-scaled objects observed (up to redshift = 9.4), standard candles through well established and robust correlations. However, GRBs spanning several orders of magnitude in their energetics are far from being standard candles. We describe the advances in the prompt correlation research in the past decades, with particular focus paid to the discoveries in the last 20 years.

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A Close Correlation between the Spectral Lags and Redshifts of Gamma-Ray Bursts

Cited by 4 publications

References 37 publications

Selection Effects on the Observed Redshift Dependence of Gamma-Ray Burst Jet Opening Angles

Selection Effects on the Observed Redshift Dependence of Gamma-Ray Burst Jet Opening Angles

Broadband Light Curve Characteristics of GRBs 980425 and 060218 and Comparison with Long‐Lag, Wide‐Pulse GRBs

Gamma-Ray Burst Prompt Correlations

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