Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0704.0791)
· References in the article
· Citations to the Article (11) (Citation History)
· Refereed Citations to the Article
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
Spectral analysis of Swift long gamma-ray bursts with known redshift
Authors:
Cabrera, J. I.; Firmani, C.; Avila-Reese, V.; Ghirlanda, G.; Ghisellini, G.; Nava, L.
Affiliation:
AA(Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, D.F. 04510, Mexico), AB(Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, D.F. 04510, Mexico; Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy), AC(Instituto de Astronomía, Universidad Nacional Autónoma de México, Apartado Postal 70-264, D.F. 04510, Mexico), AD(Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy), AE(Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy), AF(Osservatorio Astronomico di Brera, via E. Bianchi 46, I-23807 Merate, Italy; Universitá degli studi dell'Insubria, Dipartimento di Fisica e Matematica, via Valleggio 11, I-22100 Como, Italy)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 382, Issue 1, pp. 342-355. (MNRAS Homepage)
Publication Date:
11/2007
Origin:
MNRAS
MNRAS Keywords:
gamma rays: bursts
Abstract Copyright:
(c) 2007 The Authors. Journal compilation © 2007 RAS
DOI:
10.1111/j.1365-2966.2007.12374.x
Bibliographic Code:
2007MNRAS.382..342C

Abstract

We study the spectral and energetics properties of 47 long-duration gamma-ray bursts (GRBs) with known redshift, all of them detected by the Swift satellite. Due to the narrow energy range (15-150 keV) of the Swift-BAT detector, the spectral fitting is reliable only for fitting models with two or three parameters. As high uncertainty and correlation among the errors is expected, a careful analysis of the errors is necessary. We fit both the power law (PL, two parameters) and cut-off power law (CPL, three parameters) models to the time-integrated spectra of the 47 bursts, and we present the corresponding parameters, their uncertainties and the correlations among the uncertainties. The CPL model is reliable only for 29 bursts for which we estimate the νfν peak energy Epk. For these GRBs, we calculate the energy fluence and the rest-frame isotropic-equivalent radiated energy, Eγ,iso, as well as the propagated uncertainties and correlations among them. We explore the distribution of our homogeneous sample of GRBs on the rest-frame diagram E'pk versus Eγ,iso. We confirm a significant correlation between these two quantities (the `Amati' relation) and we verify that, within the uncertainty limits, no outliers are present. We also fit the spectra to a Band model with the high-energy PL index frozen to -2.3, obtaining a rather good agreement with the `Amati' relation of non-Swift GRBs.
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints
    


SAO/NASA ADS Homepage | ADS Sitemap | Query Form | Basic Search | Preferences | HELP | FAQ