An Interpretation of the $h{\nu }_{peak}$ - $E_{iso}$ Correlation for GRB

Abstract

The $h{\nu }_{peak}/100KeV\sim [E_{iso}/10^{52}\mathrm{erg}{]}^{1/2}$ correlation reported recently by Amati et al. (2002) and Lamb et al. (2003) for long GRB's can be interpreted as a viewing angle effect if the emitting region of the fireball is ring-shaped.

12 pages. 5 figures

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