Closure Relations for E Pair-signatures in Gamma-ray Bursts
نویسنده
چکیده
We present recipes to diagnose the fireball of gamma-ray bursts (GRBs) by combining observations of e pair-signatures (the pair-annihilation line and the cutoff energy due to the pair-creation process). Our recipes are largely model-independent and extract information even from the non-detection of either pair-signature. We evaluate physical quantities such as the Lorentz factor, optical depth and pair-to-baryon ratio, only from the observable quantities. In particular, we can test whether prompt emission of GRBs comes from the pair/baryonic photosphere or not. The future-coming Gamma-Ray Large Area Space Telescope (GLAST) satellite will provide us with good chances to use our recipes by detecting pair-signatures. Subject headings: gamma rays: bursts — gamma rays: theory — plasmas
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