Landing page for project EG108

Theoretical modelling predicts that processes resulting in neutrino emission should also produce gamma-ray radiation. In September 2017, IceCube reported high energy neutrino IC 170922A, from a position consistent with the blazar TXS 0506+056, which was also flaring brightly in gamma-rays, as observed by Fermi-LAT and MAGIC. However, the general picture remains subject to large uncertainties, both because of statistical and theoretical considerations. From a multi-messenger perspective, it is thus mandatory to be ready to follow up gamma-ray blazars in spatial coincidence with neutrinos. High angular resolution observations will firstly help in the association of the neutrino with the blazar and, whenever a connection is made, they will provide information on the parsec scale properties of the jet associated with the neutrino emission. In the present project, we request triggered 5 GHz e-VLBI observations of gamma-ray blazars cospatial with IceCube neutrinos in the northern sky, up to two times over the next year. Our team includes members of the VLBI community as well as of the IceCube, Fermi-LAT, and CTA collaborations in a synergetic approach that will exploit at best the real-time capabilities of the EVN.

This data is part of the archive of VLBI data maintained by JIVE on behalf of the EVN, a network of radio telescopes located primarily in Europe and Asia, with additional antennas in South Africa. The EVN archive itself has the DOI https://doi.org/10.17616/R3Z197