Evolution of the Low-Energy Photon Spectra in Gamma-Ray Bursts

Crider, A.; Liang, Edison; Smith, I. A.; Preece, R. D.; Briggs, M. S.; Pendleton, G. N.; Pačiesas, W. S.; Band, D. L.; Matteson, J. L.

doi:10.1086/310574

Cited by 221 publications

(273 citation statements)

References 17 publications

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“…This last point is particularly noteworthy. Crider et al (1997), Lloyd-Ronning & Petrosian (2002) and later Kaneko et al (2006) found a significant correlation between E p and α in the time-resolved spectra of several GRBs. Supported by our simulations, we point out the possibility that a parameter reconstruction effect is at work in addition to any intrinsic correlation between E p and α.…”

Section: Analysis Of the Gbm Datamentioning

confidence: 87%

Rest-frame properties of 32 gamma-ray bursts observed by theFermiGamma-ray Burst Monitor

Gruber

Greiner

Kienlin

et al. 2011

A&A

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Aims. In this paper we study the main spectral and temporal properties of gamma-ray bursts (GRBs) observed by Fermi/GBM. We investigate these key properties of GRBs in the rest-frame of the progenitor and test for possible intra-parameter correlations to better understand the intrinsic nature of these events. Methods. Our sample comprises 32 GRBs with measured redshift that were observed by GBM until August 2010. 28 of them belong to the long-duration population and 4 events were classified as short/hard bursts. For all of these events we derive, where possible, the intrinsic peak energy in the νF ν spectrum (E p,rest ), the duration in the rest-frame, defined as the time in which 90% of the burst fluence was observed (T 90,rest ) and the isotropic equivalent bolometric energy (E iso ). Results. The distribution of E p,rest has mean and median values of 1.1 MeV and 750 keV, respectively. A log-normal fit to the sample of long bursts peaks at ∼800 keV. No high-E p population is found but the distribution is biased against low E p values. We find the lowest possible E p that GBM can recover to be ≈15 keV. The T 90,rest distribution of long GRBs peaks at ∼10 s. The distribution of E iso has mean and median values of 8.9 × 10 52 erg and 8.2 × 10 52 erg, respectively. We confirm the tight correlation between E p,rest and E iso (Amati relation) and the one between E p,rest and the 1-s peak luminosity (L p ) (Yonetoku relation). Additionally, we observe a parameter reconstruction effect, i.e. the low-energy power law index α gets softer when E p is located at the lower end of the detector energy range. Moreover, we do not find any significant cosmic evolution of neither E p,rest nor T 90,rest .

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Section: Analysis Of the Gbm Datamentioning

confidence: 87%

Rest-frame properties of 32 gamma-ray bursts observed by theFermiGamma-ray Burst Monitor

Gruber

Greiner

Kienlin

et al. 2011

A&A

Self Cite

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“…The empirical correlations among time-resolved spectral parameters were examined for BATSE and Fermi/GBM samples (Crider et al 1997;Preece et al 1998;Lloyd-Ronning & Petrosian 2002;Kaneko et al 2006;Goldstein et al 2012). The most significant correlation is found between E peak and low-energy spectral index for the time-resolved spectra of individual bursts.…”

Section: Spectral Analysismentioning

confidence: 99%

The spectral catalogue of INTEGRAL gamma-ray bursts

Bošnjak

Götz

Bouchet

et al. 2013

A&A

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We present the updated INTEGRAL catalogue of gamma-ray bursts (GRBs) observed between December 2002 and February 2012. The catalogue contains the spectral parameters for 59 GRBs localized by the INTEGRAL Burst Alert System (IBAS). We used the data from the two main instruments on board the INTEGRAL satellite: the spectrometer SPI (SPectrometer on INTEGRAL) nominally covering the energy range 20 keV−8 MeV, and the imager IBIS (the Imager on Board the INTEGRAL Satellite) operating in the range from 15 keV to 10 MeV. For the spectral analysis we applied a new data extraction technique, developed to explore the energy regions of highest sensitivity for both instruments, SPI and IBIS. It allowed us to analyse the GRB spectra over a broad energy range and to determine the bursts' spectral peak energies. The spectral analysis was performed on the whole sample of GRBs triggered by IBAS, including all the events observed in the period December 2002 to February 2012. The catalogue contains the trigger times, burst coordinates, positional errors, durations, and peak fluxes for 28 unpublished GRBs observed between September 2008 and February 2012. The light curves in the 20−200 keV energy band of these events were derived using IBIS data. We compare the prompt emission properties of the INTEGRAL GRB sample with the BATSE and Fermi samples.

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“…To address the open issue of whether classical synchrotron radiation or modified processes operate during the prompt GRB phase, ACT will provide high S/N hard X-ray spectra with good time resolution, so that we can study the temporal hard-to-soft evolution (e.g., [24]), determine the detailed spectral shape below the peak in the socalled Band function, and follow its correlation with the photon flux.…”

Section: Gamma Ray Burstsmentioning

confidence: 99%