Standard GRB, Dirty Fireballs, and the Excluded Middle

Abstract

It is shown that the contribution of faint gamma-ray bursts (GRB) to the total allsky GRB energy flux is small. The allsky flux of GRB appears to be $5.3\times 10^{-3}$ erg/$\mathrm{c}{\mathrm{m}}^2\mathrm{y}$, with little additional component hidden within weak or otherwise undetectable GRB. This significantly constrains physical models of GRB and dirty fireballs, suggesting a rather sharp dichotomy between them should the latter exist.

to appear in The Astrophysical Journal

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• On extreme transient events from rotating black holes and their gravitational wave emission
• Prospects for multi-messenger extended emission from core-collapse supernovae in the Local Universe
• A matched-filter approach to radio variability and transients: searching for orphan afterglows in the VAST Pilot Survey