An independent estimate of the cosmological distance to GRB970228 and GRB970508
V.M. Lipunov, K.A. Postnov, M.E. Prokhorov (Sternberg Astronomical, Institute, Moscow, Russia)
TL;DR
This paper estimates the redshifts of two gamma-ray bursts using a binary neutron star merger model and statistical properties from BATSE observations, providing independent distance measurements.
Contribution
It introduces an independent method to estimate GRB redshifts based on binary neutron star mergers and statistical analysis, differing from traditional spectroscopic approaches.
Findings
Estimated redshift for GRB970228: 0.7 ± 0.1
Estimated redshift for GRB970508: 1.9 ± 0.1
Results depend on spectral index and star formation redshift assumptions
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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Taxonomy
TopicsGamma-ray bursts and supernovae · Statistical and numerical algorithms · Astronomy and Astrophysical Research