A test of spatial coincidence between CHIME FRBs and IceCube TeV energy neutrinos

TL;DR

This study investigates whether there is a spatial correlation between CHIME Fast Radio Bursts and IceCube TeV neutrinos, finding no significant association and setting upper limits on possible neutrino emissions from FRBs.

Contribution

First comprehensive search for spatial coincidence between CHIME FRBs and IceCube TeV neutrinos, establishing upper limits and confirming no significant correlation.

Findings

No statistically significant spatial association found.

Set 90% Bayesian credible interval upper limits on FRB-induced neutrinos.

Concluded that CHIME FRBs are unlikely sources of IceCube TeV neutrinos.

Abstract

We search for a spatial association between the CHIME FRBs and IceCube neutrinos detected in the TeV energy range, by counting the total number of neutrino-FRB pairs with angular separations of $< 3 $ degrees, as well as within the observed neutrino error circle. This number constitutes the total signal events, which is then compared to the total background, corresponding to the null hypothesis of no spatial association. The background was obtained from the total neutrino-FRB matches in off-source angular windows with the same solid angle as the signal window. We do not find any statistically significant excess compared to the background. Therefore, we conclude that there is no evidence for an angular correlation between the IceCube neutrinos in the TeV energy range and CHIME FRBs. For each of these searches, we report 90% Bayesian credible interval upper limits on the observed FRB-induced neutrinos.