GRBs spectral correlations and their cosmological use

Abstract

The correlations involving the long-GRB prompt emission energy represent a new key to understand the GRB physics. These correlations have been proved to be the tool which makes long-GRBs a new class of standard candles. Gamma Ray Bursts, being very powerful cosmological sources detected in the hard X-ray band, represent a new tool to investigate the Universe in a redshift range which is complementary to that covered by other cosmological probes (SNIa and CMB). A review of the Ep-Eiso, Ep-Egamma, Ep-Eiso-tjet, Ep-Liso-T0.45 correlations is presented. Open issues related to these correlations (e.g. presence of outliers and selection effects) and to their use for cosmographic purposes (e.g. dependence on model assumptions) are discussed. Finally, the relevance of thermal components in GRB spectra is discussed in the light of some of the models recently proposed for the interpretation of the spectral-energy correlations.

10 pages, 6 figures. To appear in Phil. Trans. Roy. Soc. A. Proc. of the Royal Society Discussion meeting on Gamma-ray Bursts, September 18-20, 2006

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• The X-shooter GRB afterglow legacy sample (XS-GRB)
• Observations of GRBs at High Redshift
• Accounting for Selection Bias and Redshift Evolution in GRB Radio Afterglow Data
• Gamma Ray Bursts and their links with Supernovae and Cosmology
• Nonthermal Synchrotron Radiation from Gamma Ray Burst External Shocks and the X-ray Flares Observed with Swift