// Coincidence Detection Score
Awaiting calculation…
False-alarm rate: —
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LISA · mHz GW
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SNR (4-yr mission)
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Fermi-LAT · ≥100 MeV
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Flux ratio (signal/threshold)
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CTA · ≥30 GeV
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Flux ratio (signal/threshold)
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KM3NeT ARCA · ν ≥ 10 TeV
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Expected events in burst window
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LISA SNR uses the Maggiore (2007) chirp strain formula h ~ (5/96)^(1/2) · π^(-2/3) · (G M_chirp)^(5/6) / (c^(3/2) D) · f^(-7/6) evaluated at peak frequency, integrated against the LISA sensitivity curve approximation S_n(f) ~ 1.44×10⁻⁴⁷ (0.001/f)⁴ + 1.36×10⁻⁵⁵ + 1.80×10⁻⁵² f² Hz⁻¹ (Amaro-Seoane et al. 2017 approximation).
Fermi-LAT threshold: point-source sensitivity ~8×10⁻¹² erg/cm²/s (E≥100 MeV, 10-yr survey, high latitude).
CTA threshold: ~5×10⁻¹³ erg/cm²/s (E≥30 GeV, 50-hr pointing).
KM3NeT threshold: effective area A_eff ~2×10⁴ m² at 10 TeV for OC declination (−47°); background rate ~0.01 events/100s in 5° cone above 10 TeV (upgoing).
Distance to OC: 5.49 kpc = 1.694×10²² cm. All sensitivities are order-of-magnitude estimates for scoping purposes.
Note on OC's declination (−47°): IceCube (South Pole) has degraded sensitivity for OC as a downgoing source. KM3NeT (Mediterranean, 36°N) views OC as an upgoing source with ~3–5× better point-source sensitivity at TeV energies. H.E.S.S. (Namibia) can point at OC directly but has a ~10× higher energy threshold. The coincidence score weights KM3NeT as the primary neutrino instrument for this target.
⚠ The transient source model applies to hypothetical astrophysical transients (TDE flares, magnetar bursts) or — speculatively — the Dvali-Osmanov kugelblitz neutrino burst. No such burst has been detected from OC. The LISA EMRI calculation reflects established GR predictions for an EMRI in OC's mass range; EMRI detection is a realistic near-future science case, not speculation.