The Search for Neutrinos from TXS 0506+056 with the ANTARES Telescope

Giulia Illuminati,C Spiering

doi:10.1051/epjconf/201920702004

Giulia Illuminati, C Spiering

Open Access

https://doi.org/10.1051/epjconf/201920702004

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Abstract

A high-energy neutrino, IC170922A, detected by the IceCube experiment was found to be positionally coincident with the direction of a known blazar, TXS 0506+056, observed in γ-rays and at other wavelengths of the electromagnetic spectrum. Here, we present the results of three different searches for neutrino candidates, associated either with the IC170922A event or with the TXS 0506+056 blazar, performed by the ANTARES Collaboration. The three searches, an online follow-up of the IceCube alert, a standard time-integrated point-source analysis and a time-dependent search, yielded no significant observation. Consequently, 90% C.L. upper limits on the one-flavour neutrino flux and fluence have been derived.

Highlights

On 22 September 2017, the IceCube Collaboration detected a high-energy (HE) neutrinoinduced muon track, with high probability of being of astrophysical origin [1]
The IceCube Collaboration performed a search for clustering in time at the position of TXS 0506+056 assuming two different generic profile shapes: a Gaussian-shaped time window and a box-shaped time window [1]
Three different analyses were performed using data of the ANTARES telescope [4] to investigate the location of the IceCube HE event and of the blazar

Summary

Introduction

On 22 September 2017, the IceCube Collaboration detected a high-energy (HE) neutrinoinduced muon track, with high probability of being of astrophysical origin [1]. It was soon found that IC170922A was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056 [3] Triggered by this association, the IceCube Collaboration performed a search for clustering in time at the position of TXS 0506+056 assuming two different generic profile shapes: a Gaussian-shaped time window and a box-shaped time window [1]. The analysis yielded a 3.5σ evidence for an excess of high-energy neutrino events, with respect to atmospheric backgrounds, at the position of the blazar between September 2014 and March 2015 Prompted by these findings, three different analyses were performed using data of the ANTARES telescope [4] to investigate the location of the IceCube HE event and of the blazar.

Online searches

Time-integrated search

Time-dependent searches

Findings

Conclusions