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Gamma Ray Bursts Spectral–Energy correlations: recent results

Published online by Cambridge University Press:  24 February 2011

Giancarlo Ghirlanda
Giancarlo Ghirlanda*
Affiliation:
Osservatorio Astronomico di Brera, Via Bianchi 46 Merate I–23807Italy email: [email protected]
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Abstract

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The correlations between the rest frame peak of the νFν spectrum of GRBs (Epeak) and their isotropic energy (Eiso) or luminosity (Liso) could have several implications for the understanding of the GRB prompt emission. These correlations are presently founded on the time–averaged spectral properties of a sample of 95 bursts, with measured redshifts, collected by different instruments in the last 13 years (pre–Fermi). One still open issue is wether these correlations have a physical origin or are due to instrumental selection effects. By studying 10 long and 14 short GRBs detected by Fermi we find that a strong time–resolved correlation between Epeak and the luminosity Liso is present within individual GRBs and that it is consistent with the time–integrated correlation. This result is a direct proof of the existence in both short and long GRBs of a similar physical link between the hardness and the luminosity which is not due to instrumental selection effects. The origin of the Epeak – Liso correlation should be searched in the radiation mechanism of the prompt emission.

Keywords

gamma rays: burstsradiation mechanisms: nonthermalsupernovae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S275: Jets at all Scales , September 2010 , pp. 344 - 348
Copyright
Copyright © International Astronomical Union 2011

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