The difference between the Amati and Ghirlanda relations

Amir Levinson, David Eichler

Research output: Contribution to journalArticlepeer-review

41 Scopus citations


We point out that the beaming correction commonly inferred from the achromatic breaks in the afterglow light curve is biased in situations where the isotropic equivalent energy is affected by factors other than the spread in opening angles. In particular, it underestimates the beaming factor of sources observed off-axis. Here we show that both the slopes and scatters in the Amati and Ghirlanda relations, and the difference between them, are quantitatively consistent with a recently proposed model in which the Eiso-v peak relation, as originally derived by Amati et al., is due to viewing angle effects. The quantitative difference between them confirms the relations between opening angle and break time suggested by Frail et al.

Original languageEnglish
Pages (from-to)L13-L16
JournalAstrophysical Journal
Issue number1 II
StatePublished - 10 Aug 2005


  • Black hole physics
  • Gamma rays: bursts
  • Gamma rays: theory

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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