Search for neutrinos in coincidence with gravitational wave events from the LIGO-Virgo O3a Observing Run with the Super-Kamiokande detector - Data release

This data release is associated with the publication "Search for neutrinos in coincidence with gravitational wave events from the LIGO-Virgo O3a Observing Run with the Super-Kamiokande detector". It is available on arXiv and submitted to ApJ. The data release contains:<br> - figures from the paper and supplementary figures (e.g. different neutrino flavours for flux/Eiso limits)<br> - CSV file with full results of individual follow-ups (number of observed events, flux/Eiso limits)<br> - ROOT files with Super-Kamiokande detector effective area<br> - instruction file (README.txt) with details on how to read and use the content of the data release The full author list and acknowledgements for the Super-Kamiokande collaboration are described in the article. Full abstract: The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO-Virgo Collaboration (LVC). Both low-energy (7−100 MeV) and high-energy (0.1−105 GeV) samples were analyzed in order to cover a very wide neutrino spectrum. Follow-ups of 36 (out of 39) gravitational waves reported in the GWTC-2 catalog were examined; no significant excess above the background was observed, with 10 (24) observed neutrinos compared with 4.8 (25.0) expected events in the high-energy (low-energy) samples. A statistical approach was used to compute the significance of potential coincidences. For each observation, p-values were estimated using neutrino direction and LVC skymap; the most significant event (GW190602_175927) is associated with a post-trial p-value of 7.8% (1.4σ). Additionally, flux limits were computed independently for each sample, and by combining the samples. The energy emitted as neutrinos by the identified gravitational wave sources was constrained, both for given flavors as well as for all-flavors assuming equipartition between the different flavors, independently for each trigger and by combining sources of the same nature.

{"references": ["Data release associated to arXiv:2104.09196"]}

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