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Journal Article

#### Coincident detection significance in multimessenger astronomy

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##### Fulltext (public)

1712.05392.pdf

(Preprint), 2MB

##### Supplementary Material (public)

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##### Citation

Ashton, G., Burns, E., Dal Canton, T., Dent, T., Eggenstein, H.-B., Nielsen, A. B., et al. (2018).
Coincident detection significance in multimessenger astronomy.* The Astrophysical Journal,*
*860*(1): 6. doi:10.3847/1538-4357/aabfd2.

Cite as: http://hdl.handle.net/21.11116/0000-0000-3D2F-9

##### Abstract

We derive a Bayesian criterion for assessing whether signals observed in two
separate data sets originate from a common source. The Bayes factor for a
common vs. unrelated origin of signals includes an overlap integral of the
posterior distributions over the common source parameters. Focusing on
multimessenger gravitational-wave astronomy, we apply the method to the spatial
and temporal association of independent gravitational-wave and electromagnetic
(or neutrino) observations. As an example, we consider the coincidence between
the recently discovered gravitational-wave signal GW170817 from a binary
neutron star merger and the gamma-ray burst GRB 170817A: we find that the
common source model is enormously favored over a model describing them as
unrelated signals.