Multi-wavelength follow-up observations of ANTARES neutrino alerts
Résumé
High-energy neutrinos could be produced in the interaction of charged cosmic rays with matteror radiation surrounding astrophysical sources. Transient phenomena, such as gamma-ray bursts,core-collapse supernovae or active galactic nuclei are promising candidates to emit high-energyneutrinos. To search for coincidences between a transient event and a neutrino emission, a followupprogram of neutrino alerts is in operation within the ANTARES Collaboration since 2009.This program triggers a network of robotic optical telescopes immediately after the detection ofa neutrino event and schedule several observations in the following weeks. The most interestingneutrino candidates are also followed by the Swift XRT telescope and the Murchison Wide fieldArray radio telescope and the H.E.S.S. very high-energy gamma-ray telescope. By combiningthe information provided by the ANTARES neutrino telescope with information coming fromother observatories, the probability of detecting a source is enhanced, allowing the possibilityof identifying a neutrino progenitor from a single detected event. No significant counterpartassociated with a neutrino emission has been identified during image analysis.