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 Publish in OALib Journal ISSN: 2333-9721 APC: Only $99  Views Downloads  Relative Articles An independent distance estimate to CW Leo The Gamma Ray Bursts GRB970228 and GRB970508: What Have We Learnt? The Extinction Towards the GRB970228 Field Hubble Space Telescope Imaging of the Optical Transient Associated with GRB970508 The Distance of GRB is Independent from the Redshift Hubble Space Telescope Imaging of the Field of GRB970508 Is the Fuzziness of GRB970228 constant? QCD estimate of the long-distance effect in$B \to K^* γ\$ Using block counts and distance sampling to estimate populations of chamois A Time Independent Energy Estimate for Outgoing Scalar Waves in the Kerr Geometry More...
Physics  1997

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

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Abstract:

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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