What is the minimum source photon flux required to enable neutrino detection with IceCube? The color map shows the minimum photon flux Φγ,min (in Jy and ph cm-2 s-1) as a function of the bolometric luminosity Lbol and the variability timescale tvar of the flaring event for an outflow bulk Lorentz factor Γ = 1,10,100. A neutrino flare can be detectable if the observed photon flux Φγ,obs ≳ Φγ,min, above the minimum threshold energy ϵth (red lines) for soft photon spectra, and at the observed photon break energy ϵb for hard spectra. Here ηB = ηp = 1, but the most conservative estimate should use ηp = 100. Overlaid objets as in Fig 1. Type Ibc supernovae should be treated with care (see Sect. 6.2).
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