Physics
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526...87p&link_type=abstract
GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 87-91 (2000).
Physics
4
Gamma-Ray Sources, Gamma-Ray Bursts, Observational Cosmology, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Cosmic Rays
Scientific paper
We analyze the distribution of total energy of bursts with optical afterglows. Our sample contains eleven bursts for which there are BATSE data allowing detailed fits to the spectra. Six of these bursts have measured redshifts while five have host galaxies whose redshifts are unknown. Using a new technique based on the distribution of magnitudes of observed high redshift galaxies, we bracket the expected redshifts of these host galaxies. We perform a maximum likelihood fit for the energy distribution of these GRBs. Assuming that the total energy emitted has a log-normal distribution, we find that the average isotropic energy emitted is Eγ=1.5-0.6+1.5×1053 ergs (for H0=65 km s-1 Mpc-1, Ωm=0.3 and ΩA=0.7) with a standard deviation σγ=1.2-0.4+0.6. The corresponding distribution of X-ray afterglow energy (for seven bursts) is significantly narrower with σx=0.5-0.25+0.4 and Ex=3.8-1.5+2×1051 ergs, in agreement with the prediction of the patchy shell model of Kumar and Piran [1]. We also give a table with the detailed fits to the spectra of the 11 GRBs with optical afterglow with BATSE data. .
Band David
Jimenez Raul
Piran Tsvi
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