# Search for High-energy Neutrinos from Gravitational Wave Event GW151226 and Candidate LVT151012 with ANTARES and IceCube

## TL;DR

This study conducted a search for high-energy neutrinos associated with two gravitational wave events, GW151226 and LVT151012, using ANTARES and IceCube, finding no significant neutrino counterparts and setting upper limits on neutrino emission.

## Contribution

First combined high-energy neutrino search for GW151226 and LVT151012 with ANTARES and IceCube, providing constraints on neutrino emission from binary black hole mergers.

## Key findings

- No neutrino counterparts detected within ±500 s of GW events.
- Detected neutrino candidates are consistent with background expectations.
- Set upper limits on neutrino emission energy from GW151226.

## Abstract

The Advanced LIGO observatories detected gravitational waves from two binary black hole mergers during their first observation run (O1). We present a high-energy neutrino follow-up search for the second gravitational wave event, GW151226, as well as for gravitational wave candidate LVT151012. We find 2 and 4 neutrino candidates detected by IceCube, and 1 and 0 detected by ANTARES, within $\pm500$ s around the respective gravitational wave signals, consistent with the expected background rate. None of these neutrino candidates are found to be directionally coincident with GW151226 or LVT151012. We use non-detection to constrain isotropic-equivalent high-energy neutrino emission from GW151226 adopting the GW event's 3D localization, to less than $2\times 10^{51}-2\times10^{54}$ erg.