An independent estimate of the cosmological distance to GRB970228 and GRB970508

Details An independent estimate of the cosmological distance to GRB970228 and GRB970508 An independent estimate of the cosmological distance to GRB970228 and GRB970508

1997-03-27

arxiv.org/abs/astro-ph/9703181v3

Astronomy and Astrophysics

Astrophysics

LaTeX, A&A style, 3 pages, includes 2 postscript figures

Scientific paper

Assuming binary neutron star mergings as a standard-candle model for GRBs, an independent estimate is obtained for the redshift of GRB970228 and GRB970508 with optical counterparts, using mean statistical properties of GRBs observed by BATSE. We derive z=0.7\pm 0.1 and z=1.9\pm 0.1 for GRB970228 and GRB970508 respectively, depending on the power-law index of the GRB spectrum s=-1.1\pm 0.3 and the value of the redshift of the initial star formation z_*=3-10 in a flat \Omega=1 Universe with a cosmological term \Lambda=0.7.

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