Redshift-dependent lag—luminosity relation in 565 BATSE gamma-ray bursts

Tsutsui, Ryo; Nakamura, Takashi; Yonetoku, Daisuke; Murakami, T.; Tanabe, Sachiko; Kodama, Yoshiki

doi:10.1111/j.1745-3933.2008.00455.x

Cited by 20 publications

(21 citation statements)

References 20 publications

(37 reference statements)

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“…Massaro et al (2008) investigated the cosmological relation between the GRB energy index and the redshift, and presented a statistical analysis of the Amati relation searching for possible functional biases. Tsutsui et al (2008) reported a redshift dependence of the lag-luminosity relation in 565 BASTE GRBs. Oguri & Takahashi (2006) and Schaefer (2007) discussed the gravitational lensing and Malmquist biases of GRBs, and found that the biases are small.…”

Section: Summary and Discussionmentioning

confidence: 99%

A Cosmology‐Independent Calibration of Gamma‐Ray Burst Luminosity Relations and the Hubble Diagram

Liang

Xiao

Liu

et al. 2008

Astrophysical Journal

175

192

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An important concern in the application of gamma-ray bursts (GRBs) to cosmology is that the calibration of GRB luminosity/energy relations depends on the cosmological model, due to the lack of a sufficient low-redshift GRB sample. In this paper, we present a new method to calibrate GRB relations in a cosmology-independent way. Since objects at the same redshift should have the same luminosity distance, and since the distance moduli of Type Ia supernovae (SNe Ia) obtained directly from observations are completely cosmology independent, we obtain the distance modulus of a GRB at a given redshift by interpolating from the Hubble diagram of SNe Ia. Then we calibrate seven GRB relations without assuming a particular cosmological model and construct a GRB Hubble diagram to constrain cosmological parameters. From the 42 GRBs at 1:4 < z 6:6, we obtain M ¼ 0:25 þ0:04 À0:05 , Ã ¼ 0:75 þ0:05 À0:04for the flat ÃCDM model, and for the dark energy model with a constant equation of state w 0 ¼ À1:05 þ0:27 À0:40 , which is consistent with the concordance model in a 1 confidence region.

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Section: Summary and Discussionmentioning

confidence: 99%

A Cosmology‐Independent Calibration of Gamma‐Ray Burst Luminosity Relations and the Hubble Diagram

Liang

Xiao

Liu

et al. 2008

Astrophysical Journal

175

192

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“…In general they migrate to later times and become wider going to lower energy, although some GRBs with the opposite trend have been observed ). This so-called "spectral lag" correlates with the peak flux of the GRBs (Norris et al 2000;Norris 2002;Tsutsui et al 2008): long spectral lags have been measured mainly in GRBs with low peak fluxes, while short spectral lags have been observed in bursts with both high and low peak fluxes. Based on these findings, one can divide GRBs in three groups: bright with short lags, faint with short lags, and faint with long lags.…”

Section: On the Relation Between Spectral Lags And Peak Fluxesmentioning

confidence: 97%

The updated spectral catalogue of INTEGRAL gamma-ray bursts

Vianello

Götz

Mereghetti

2009

A&A

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We present a catalogue with the properties of all the bursts detected and localized by the IBIS instrument onboard the INTEGRAL satellite from November 2002 to September 2008. The sample is composed of 56 bursts, corresponding to a rate of ∼0.8 GRB per month. Thanks to the performances of the INTEGRAL Burst Alert System, 50% of the IBIS GRBs have detected afterglows, while 5% have redshift measurements. A spectral analysis of the 43 bursts in the INTEGRAL public archive has been carried out using the most recent software and calibration, deriving an updated, homogeneous and accurate catalogue with the spectral features of the sample. When possible a time-resolved spectral analysis also has been carried out. The GRBs in the sample have 20-200 keV fluences in the range 5 × 10 −8 -2.5 × 10 −4 erg cm −2 , and peak fluxes in the range 0.11-56 ph cm −2 s −1 . While most of the spectra are well fitted by a power law with photon index ∼1.6, we found that 9 bursts are better described by a cut-off power law, resulting in E p values in the range 35-190 keV. Altough these results are comparable to those obtained with BAT onboard Swift, there is marginal evidence that ISGRI detects dimmer bursts than Swift/BAT. Using the revised spectral parameters and an updated sky exposure map that also takes into account the effects of the GRB trigger efficiency, we strengthen the evidence for a spatial correlation with the super galactic plane of the faint bursts with long spectral lag.

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“…Most of the previous work on spectral lags has been based on observations with the Burst and Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (Tsutsui et al 2008;Hakkila et al 2008Hakkila et al , 2007Chen et al 2005;Band et al 2004; Salmonson & Galama 2002;Norris 2002;Band 1997). The launch of the Swift satellite (Gehrels et al 2004) ushered in a new era of GRB research.…”

Section: Introductionmentioning

confidence: 99%

SPECTRAL LAGS AND THE LAG-LUMINOSITY RELATION: AN INVESTIGATION WITHSWIFTBAT GAMMA-RAY BURSTS

Ukwatta

Stamatikos

Dhuga

et al. 2010

ApJ

131

137

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Spectral lag, the time difference between the arrival of high-energy and low-energy photons, is a common feature in gamma-ray bursts (GRBs). Norris et al. reported a correlation between the spectral lag and the isotropic peak luminosity of GRBs based on a limited sample. More recently, a number of authors have provided further support for this correlation using arbitrary energy bands of various instruments. In this paper, we report on a systematic extraction of spectral lags based on the largest Swift sample to date of 31 GRBs with measured redshifts. We extracted the spectral lags for all combinations of the standard Swift hard X-ray energy bands: 15-25 keV, 25-50 keV, 50-100 keV, and 100-200 keV and plotted the time dilation corrected lag as a function of isotropic peak luminosity. The mean value of the correlation coefficient for various channel combinations is −0.68 with a chance probability of ∼0.7 × 10 −3 . In addition, the mean value of the power-law index is 1.4 ± 0.3. Hence, our study lends support to the existence of a lag-luminosity correlation, albeit with large scatter.

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Redshift-dependent lag—luminosity relation in 565 BATSE gamma-ray bursts

Cited by 20 publications

References 20 publications

A Cosmology‐Independent Calibration of Gamma‐Ray Burst Luminosity Relations and the Hubble Diagram

A Cosmology‐Independent Calibration of Gamma‐Ray Burst Luminosity Relations and the Hubble Diagram

The updated spectral catalogue of INTEGRAL gamma-ray bursts

SPECTRAL LAGS AND THE LAG-LUMINOSITY RELATION: AN INVESTIGATION WITHSWIFTBAT GAMMA-RAY BURSTS

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