Spectral evolution of <i>Fermi</i>/GBM short gamma-ray bursts

Ghirlanda, G.; Ghisellini, G.; Nava, Lara; Burlon, D.

doi:10.1111/j.1745-3933.2010.00977.x

Cited by 40 publications

(42 citation statements)

References 52 publications

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“…The measured scatter of the peak -tot relation is 0.17 ± 0.08. This result was reported for the first time by Golenetskii et al [178] and later confirmed by Borgonovo and Ryde [179]; Ghirlanda et al [180]; Guiriec et al [181]; Ghirlanda et al [165].…”

Section: Correlations Between the Energetics And The Peak Energysupporting

confidence: 75%

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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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Section: Correlations Between the Energetics And The Peak Energysupporting

confidence: 75%

“…Later, this correlation was verified by Ghirlanda et al [165] and Lü et al [143]. Ghirlanda et al [165], studying the spectral evolution of 13 SGRBs detected by Fermi/GBM, investigated spectra resolved in the 8 keV-35 MeV energy range, and confirmed the results of Liang et al [164].…”

Section: The γ 0 -Prompt and γ 0 -Iso Correlations And Their Physicalsupporting

confidence: 65%

Gamma-Ray Burst Prompt Correlations

Dainotti

Vecchio

Tarnopolski

2018

Advances in Astronomy

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“…Despite lacking a complete knowledge of the true cosmic rate and redshift distribution, here we argue and show that short GRBs exhibit very similar prompt-emission correlations and population distribution to those of long GRBs as presented by Shahmoradi (2013b), both qualitatively and, under plausible cosmic rate assumptions, also quantitatively. This result, along with other recent works on the time-resolved and time-integrated spectral properties of SGRBs (e.g., Ghirlanda et al 2011;Shahmoradi & Nemiroff 2011;Zhang, Chen & Huang 2012;Tsutsui et al 2013;Calderone et al 2014) points towards the possibility of a unified mechanism responsible for the prompt gamma-ray emission of the two GRB classes, independently of the diverse progenitor candidates for the two GRB populations.…”

Section: Introductionmentioning

confidence: 78%

Short versus long gamma-ray bursts: a comprehensive study of energetics and prompt gamma-ray correlations

Shahmoradi

Nemiroff

2015

Monthly Notices of the Royal Astronomical Society

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We present the results of a comprehensive study of the luminosity function, energetics, prompt gamma-ray correlations, and classification methodology of short-hard and long-soft GRBs (SGRBs & LGRBs), based on observational data in the largest catalog of GRBs available to this date: BATSE catalog of 2702 GRBs. We find that: 1. The least-biased classification method of GRBs into short and long, solely based on prompt-emission properties, appears to be the ratio of the observed spectral peak energy to the observed duration (R = E p /T 90 ) with the dividing line at R 50[keV s −1 ]. 2. Once data is carefully corrected for the effects of the detection threshold of gammaray instruments, the population distribution of SGRBs and LGRBs can be individually well described as multivariate log-normal distribution in the 4-dimensional space of the isotropic peak gamma-ray luminosity, total isotropic gamma-ray emission, the intrinsic spectral peak energy, and the intrinsic duration. 3. Relatively large fractions of SGRBs and LGRBs with moderate-to-low spectral peak energies have been missed by BATSE detectors. 4. Relatively strong and highly significant intrinsic hardnessbrightness and duration-brightness correlations likely exist in both populations of SGRBs and LGRBs, once data is corrected for selection effects. The strengths of these correlations are very similar in both populations, implying similar mechanisms at work in both GRB classes, leading to the emergence of these prompt gamma-ray correlations.

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“…Band within each burst (i.e., F i Band -E peak,i Band relation-see, for instance, Golenetskii et al 1983;Borgonovo & Ryde 2001;Liang et al 2004;Guiriec et al 2010Guiriec et al , 2015aGuiriec et al , 2015bGhirlanda et al 2011aGhirlanda et al , 2011bLu et al 2012). Although this correlation globally follows a PL, there is often large scatter in the data of each burst and the PL indices can be dramatically different from burst to burst.…”

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confidence: 99%

Cgro/Batse Data Support the New Paradigm for GRB Prompt Emission and the New – Relation

Guiriec

González²,

Sacahui

et al. 2016

ApJ

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The paradigm for gamma-ray burst (GRB) prompt emission is changing. Since early in the Compton Gamma Ray Observatory (CGRO) era, the empirical Band function has been considered a good description of the keV-MeV γ-ray prompt emission spectra despite the fact that its shape was very often inconsistent with the theoretical predictions, especially those expected in pure synchrotron emission scenarios. We have recently established a new observational model analyzing data of the NASA Fermi Gamma-ray Space Telescope. In this model, GRB prompt emission would be a combination of three main emission components: (i) a thermal-like component that we have interpreted so far as emission from the jet photosphere, (ii) a non-thermal component that we have interpreted so far as either synchrotron radiation from the propagating and accelerated charged particles within the jet or reprocessed jet photospheric emission, and (iii) an additional non-thermal (cutoff) power law (PL) extending from low to high energies in γ-rays and most likely of inverse Compton origin. In this article we reanalyze some of the bright GRBs, namely GRBs 941017, 970111, and 990123, observed with the Burst And Transient Source Experiment (BATSE) on board CGRO with the new model. We conclude that BATSE data for these three GRBs are fully consistent with the recent results obtained with Fermi: some bright BATSE GRBs exhibit three separate components during the prompt phase with similar spectral parameters as those reported from Fermi data. In addition, the analysis of the BATSE GRBs with the new prompt emission model results in a relation between the time-resolved energy flux of the non-thermal component, F i nTh , and its corresponding νFn spectral peak energy, E peak,i nTh (i.e., F i nTh -E peak,i nTh ), which has a similar index-when fitted to a PL-as the one initially derived from Fermi data. For GRBs with known redshifts (z) this results in a possible universal relation between the luminosity of the non-thermal component, L i nTh , and its corresponding νFn spectral peak energy in the rest frame, E peak,i NT,rest (i.e., L i nTh -E peak,i NT,rest ). We estimated the redshifts of GRBs 941017 and 970111 using GRB 990123-with z = 1.61-as a reference. The estimated redshift for GRB 941017 is typical for long GRBs and the estimated redshift for GRB 970111 is right in the range of the expected values for this burst.

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Spectral evolution of Fermi/GBM short gamma-ray bursts

Cited by 40 publications

References 52 publications

Gamma-Ray Burst Prompt Correlations

Gamma-Ray Burst Prompt Correlations

Short versus long gamma-ray bursts: a comprehensive study of energetics and prompt gamma-ray correlations

Cgro/Batse Data Support the New Paradigm for GRB Prompt Emission and the New – Relation

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