The Implications of Direct Red-Shift Measurement of $γ$-ray Bursts

Details The Implications of Direct Red-Shift Measurement of $γ$-ray Bursts The Implications of Direct Red-Shift Measurement of $γ$-ray Bursts

1997-06-04

arxiv.org/abs/astro-ph/9706045v1

Astronomy and Astrophysics

Astrophysics

12 Latex pages plus one postscript figure

Scientific paper

10.1086/310916

The recent discoveries of X-ray and optical counterparts for GRBs, and a possible discovery of a host galaxy, implies that a direct measurement of the red-shift of some GRBs host galaxies is eminent. We discuss the implications of such measurements. They could enable us to determine the GRBs luminosity distribution, the variation of the rate of GRBs with cosmic time, and even, under favorable circumstances, to estimate $\Omega$. Using GRB970508 alone, and assuming standard candles, we constrain the intrinsic GRB evolution to $\rho(z)=(1+z)^{-0.5\pm0.7}$.

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