The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts

G. Tagliaferri, R. Salvaterra, S. Campana, S. Covino, P. D’Avanzo, D. Fugazza, G. Ghirlanda, G. Ghisellini, A. Melandri, L. Nava, Boris Sbarufatti, S. Vergani

Research output: Contribution to journalConference article

Abstract

We selected a complete sub-sample of 58 Swift bright long GRBs. The sample was selected considering bursts with favorable observing conditions for ground-based follow-up observations and with the 1-second peak flux above a flux threshold of 2.6 photons cm−2 s−1 in the 15-150 keV energy band. This sample has a redshift completeness level higher than 90%. Complete samples are at the base of any population study and we used this sample to investigate the properties of long GRBs. In particular, we derived their evolution with cosmic times, focusing on the GRB luminosity function, the prompt emission spectral-energy correlations and the nature of dark bursts. If we assume that long GRBs trace the cosmic star formation, then we can reject the no-evolution scenario in which the GRB luminosity function is constant in redshift. We also confirm the existence of strong Epeak − Eiso and Epeak − Liso correlations for the bursts of this complete sample and of a genuine dark population, with - 30% of dark-burst events expected for the whole class of long GRBs. These dark-bursts events seems to generate in much denser metal-rich environments where dust must be present with respect to normal bright events.

Original languageEnglish (US)
JournalProceedings of Science
Volume2012-May
StatePublished - Jan 1 2012
Event2012 Gamma-Ray Bursts Conference, GRB 2012 - Munich, Germany
Duration: May 7 2012May 11 2012

Fingerprint

gamma ray bursts
bursts
luminosity
spectral emission
completeness
energy bands
star formation
dust
thresholds
photons
metals

All Science Journal Classification (ASJC) codes

  • General

Cite this

Tagliaferri, G., Salvaterra, R., Campana, S., Covino, S., D’Avanzo, P., Fugazza, D., ... Vergani, S. (2012). The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts. Proceedings of Science, 2012-May.
Tagliaferri, G. ; Salvaterra, R. ; Campana, S. ; Covino, S. ; D’Avanzo, P. ; Fugazza, D. ; Ghirlanda, G. ; Ghisellini, G. ; Melandri, A. ; Nava, L. ; Sbarufatti, Boris ; Vergani, S. / The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts. In: Proceedings of Science. 2012 ; Vol. 2012-May.
@article{d57cbefdaf234c449e00df389cb97771,
title = "The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts",
abstract = "We selected a complete sub-sample of 58 Swift bright long GRBs. The sample was selected considering bursts with favorable observing conditions for ground-based follow-up observations and with the 1-second peak flux above a flux threshold of 2.6 photons cm−2 s−1 in the 15-150 keV energy band. This sample has a redshift completeness level higher than 90{\%}. Complete samples are at the base of any population study and we used this sample to investigate the properties of long GRBs. In particular, we derived their evolution with cosmic times, focusing on the GRB luminosity function, the prompt emission spectral-energy correlations and the nature of dark bursts. If we assume that long GRBs trace the cosmic star formation, then we can reject the no-evolution scenario in which the GRB luminosity function is constant in redshift. We also confirm the existence of strong Epeak − Eiso and Epeak − Liso correlations for the bursts of this complete sample and of a genuine dark population, with - 30{\%} of dark-burst events expected for the whole class of long GRBs. These dark-bursts events seems to generate in much denser metal-rich environments where dust must be present with respect to normal bright events.",
author = "G. Tagliaferri and R. Salvaterra and S. Campana and S. Covino and P. D’Avanzo and D. Fugazza and G. Ghirlanda and G. Ghisellini and A. Melandri and L. Nava and Boris Sbarufatti and S. Vergani",
year = "2012",
month = "1",
day = "1",
language = "English (US)",
volume = "2012-May",
journal = "Proceedings of Science",
issn = "1824-8039",
publisher = "Sissa Medialab Srl",

}

Tagliaferri, G, Salvaterra, R, Campana, S, Covino, S, D’Avanzo, P, Fugazza, D, Ghirlanda, G, Ghisellini, G, Melandri, A, Nava, L, Sbarufatti, B & Vergani, S 2012, 'The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts', Proceedings of Science, vol. 2012-May.

The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts. / Tagliaferri, G.; Salvaterra, R.; Campana, S.; Covino, S.; D’Avanzo, P.; Fugazza, D.; Ghirlanda, G.; Ghisellini, G.; Melandri, A.; Nava, L.; Sbarufatti, Boris; Vergani, S.

In: Proceedings of Science, Vol. 2012-May, 01.01.2012.

Research output: Contribution to journalConference article

TY - JOUR

T1 - The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts

AU - Tagliaferri, G.

AU - Salvaterra, R.

AU - Campana, S.

AU - Covino, S.

AU - D’Avanzo, P.

AU - Fugazza, D.

AU - Ghirlanda, G.

AU - Ghisellini, G.

AU - Melandri, A.

AU - Nava, L.

AU - Sbarufatti, Boris

AU - Vergani, S.

PY - 2012/1/1

Y1 - 2012/1/1

N2 - We selected a complete sub-sample of 58 Swift bright long GRBs. The sample was selected considering bursts with favorable observing conditions for ground-based follow-up observations and with the 1-second peak flux above a flux threshold of 2.6 photons cm−2 s−1 in the 15-150 keV energy band. This sample has a redshift completeness level higher than 90%. Complete samples are at the base of any population study and we used this sample to investigate the properties of long GRBs. In particular, we derived their evolution with cosmic times, focusing on the GRB luminosity function, the prompt emission spectral-energy correlations and the nature of dark bursts. If we assume that long GRBs trace the cosmic star formation, then we can reject the no-evolution scenario in which the GRB luminosity function is constant in redshift. We also confirm the existence of strong Epeak − Eiso and Epeak − Liso correlations for the bursts of this complete sample and of a genuine dark population, with - 30% of dark-burst events expected for the whole class of long GRBs. These dark-bursts events seems to generate in much denser metal-rich environments where dust must be present with respect to normal bright events.

AB - We selected a complete sub-sample of 58 Swift bright long GRBs. The sample was selected considering bursts with favorable observing conditions for ground-based follow-up observations and with the 1-second peak flux above a flux threshold of 2.6 photons cm−2 s−1 in the 15-150 keV energy band. This sample has a redshift completeness level higher than 90%. Complete samples are at the base of any population study and we used this sample to investigate the properties of long GRBs. In particular, we derived their evolution with cosmic times, focusing on the GRB luminosity function, the prompt emission spectral-energy correlations and the nature of dark bursts. If we assume that long GRBs trace the cosmic star formation, then we can reject the no-evolution scenario in which the GRB luminosity function is constant in redshift. We also confirm the existence of strong Epeak − Eiso and Epeak − Liso correlations for the bursts of this complete sample and of a genuine dark population, with - 30% of dark-burst events expected for the whole class of long GRBs. These dark-bursts events seems to generate in much denser metal-rich environments where dust must be present with respect to normal bright events.

UR - http://www.scopus.com/inward/record.url?scp=85052376412&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85052376412&partnerID=8YFLogxK

M3 - Conference article

VL - 2012-May

JO - Proceedings of Science

JF - Proceedings of Science

SN - 1824-8039

ER -

Tagliaferri G, Salvaterra R, Campana S, Covino S, D’Avanzo P, Fugazza D et al. The properties of Long Gamma Ray Burst as derived from an unbiased complete sample of bright bursts. Proceedings of Science. 2012 Jan 1;2012-May.