The lag-luminosity relation in the GRB source frame: an investigation with Swift BAT bursts

Ukwatta, T. N.; Dhuga, K. S.; Stamatikos, M.; Dermer, C. D.; Sakamoto, T.; Сонбас, Э.; Parke, William C.; Maximon, L. C.; Linnemann, J. T.; Bhat, P. N.; Eskandarian, A.; Gehrels, N.; Abeysekara, Anushka Udara; Tollefson, K.; Norris, J. P.

doi:10.1111/j.1365-2966.2011.19723.x

Cited by 86 publications

(101 citation statements)

References 44 publications

(64 reference statements)

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“…These values are broadly consistent with the empirical L iso,pk -E pk (Yonetoku et al 2004) and E iso -E pk (Amati et al 2009) relations for long GRBs. Another empirical relation between the luminosity and the spectral lags that we measured to be −41 ± 28 ms between two Swift/BAT energy bands is also satisfied (Norris et al 2000;Ukwatta et al 2012).…”

Section: Prompt Emissionsupporting

confidence: 71%

MULTIWAVELENGTH OBSERVATIONS OF GRB 110731A: GeV EMISSION FROM ONSET TO AFTERGLOW

Ackermann¹,

Ajello²,

Asano³

et al. 2013

ApJ

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We report on the multiwavelength observations of the bright, long gamma-ray burst GRB 110731A, by the Fermi and Swift observatories, and by the MOA and GROND optical telescopes. The analysis of the prompt phase reveals that GRB 110731A shares many features with bright Large Area Telescope bursts observed by Fermi during the first three years on-orbit: a light curve with short time variability across the whole energy range during the prompt phase, delayed onset of the emission above 100 MeV, extra power-law component and temporally extended high-energy emission. In addition, this is the first GRB for which simultaneous GeV, X-ray, and optical data are available over multiple epochs beginning just after the trigger time and extending for more than 800 s, allowing temporal and spectral analysis in different epochs that favor emission from the forward shock in a wind-type medium. The observed temporally extended GeV emission is most likely part of the high-energy end of the afterglow emission. Both the single-zone pair transparency constraint for the prompt signal and the spectral and temporal analysis of the forward-shock afterglow emission independently lead to an estimate of the bulk Lorentz factor of the jet Γ ∼ 500-550.

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Section: Prompt Emissionsupporting

confidence: 71%

MULTIWAVELENGTH OBSERVATIONS OF GRB 110731A: GeV EMISSION FROM ONSET TO AFTERGLOW

Ackermann¹,

Ajello²,

Asano³

et al. 2013

ApJ

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“…This was followed by another confirmation of this correlation [137] with the use of 43 Swift GRBs with known redshift, which yielded = −0.82, = 5.5 × 10 −5 , and a slope of −1.2 ± 0.2, being consistent with the previous results.…”

Section: The -Correlationsupporting

confidence: 87%

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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“…Although negative lags are not necessarily unphysical (Ryde 2005), we chose to exclude them due to the logarithmic nature of the lag-luminosity relation in our plots. This was also done in previous studies of this relation by Ukwatta et al (2010Ukwatta et al ( , 2012 and others.…”

Section: Resultsmentioning

confidence: 73%

“…This relation has been studied in detail by a number of authors (Norris et al 2000;Norris 2002;Gehrels et al 2006;Schaefer 2007;Stamatikos 2008;Hakkila et al 2008;Ukwatta et al 2010Ukwatta et al , 2012Wang et al 2011) for data sets obtained by different instruments aboard different missions. The general conclusion of all these studies has been an anti-correlation L iso ∝ τ −a with a value of a ∼ 0.77-1.8.…”

Section: Introductionmentioning

confidence: 99%

“…This is accomplished by choosing two energy bands in the source frame and then projecting these in the observer frame using the relation E obs = E source /(1 + z), such that the projected energy bands lie in the Swift BAT energy range 15-350 keV. This alternative method of extracting the spectral lags in the source frame rather than the observer frame was recently used by Ukwatta et al (2012) to obtain a similar result for the L iso − τ relation, but with a higher degree of correlation between the variables.…”

Section: Introductionmentioning

confidence: 99%

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Luminosity Correlations for Gamma-Ray Bursts and Implications for Their Prompt and Afterglow Emission Mechanisms

Sultana

Kazanas

Fukumura

2012

ApJ

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We present the relation between the (z-and k-corrected) spectral lags, τ , for the standard Swift energy bands 50-100 keV and 100-200 keV and the peak isotropic luminosity, L iso (a relation reported first by Norris et al.), for a subset of 12 long Swift gamma-ray bursts (GRBs) taken from a recent study of this relation by Ukwatta et al. The chosen GRBs are also a subset of the Dainotti et al. sample, a set of Swift GRBs of known redshift, employed in establishing a relation between the (GRB frame) luminosity, L X , of the shallow (or constant) flux portion of the typical X-Ray Telescope GRB-afterglow light curve and the (GRB frame) time of transition to the normal decay rate, T brk . We also present the L X -T brk relation using only the bursts common in the two samples. The two relations exhibit a significant degree of correlation (ρ = −0.65 for the L iso -τ and ρ = −0.88 for the L X -T brk relation) and have surprisingly similar best-fit power-law indices (−1.19 ± 0.17 for L iso -τ and −1.10 ± 0.03 for L X -T brk ). Even more surprisingly, we noted that although τ and T brk represent different GRB time variables, it appears that the first relation (L iso -τ ) extrapolates into the second one for timescales τ T brk . This fact suggests that these two relations have a common origin, which we conjecture to be kinematic. This relation adds to the recently discovered relations between properties of the prompt and afterglow GRB phases, indicating a much more intimate relation between these two phases than hitherto considered.

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The lag-luminosity relation in the GRB source frame: an investigation with Swift BAT bursts

Cited by 86 publications

References 44 publications

MULTIWAVELENGTH OBSERVATIONS OF GRB 110731A: GeV EMISSION FROM ONSET TO AFTERGLOW

MULTIWAVELENGTH OBSERVATIONS OF GRB 110731A: GeV EMISSION FROM ONSET TO AFTERGLOW

Gamma-Ray Burst Prompt Correlations

Luminosity Correlations for Gamma-Ray Bursts and Implications for Their Prompt and Afterglow Emission Mechanisms

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