The gamma-ray burst spatial distribution logN(>~S) vs logs and N(>~S,1II,bII) vs s

Physics

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X-Ray Sources, X-Ray Bursts

Scientific paper

Gamma-ray burst distance scales are reviewed. Most observations are inconsistent with metagalactic (D>~30 Mpc) or extragalactic (100 Kpc ~30 keV)<=1042 ergs, an intrinsic luminosity distribution peaked toward low luminosity and having a range of ~100, and a Galactic center burst rate density n0(0)~1011 pc-3-yr-1. The total Galactic burst rate is ~400 yr-1 and the nearest burst source should lie between 5 and 1.4 Kpc for burst repetitions of 1 to 50 yrs. The high burst luminosity suggests bursts in M31 may be visible near current thresholds, i.e., ~185 yr-1 with S>~10-8 ergs-cm-2. A 3σ detection of M31 should be possible with one year of observation using a threshold of 10-7 ergs-cm-2.

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