The detection of an electromagnetic signal by Fermi-GBM, temporally and spatially coincident with the first detection of a gravitational wave (GW) coming from a neutron star merger (NSM) by LIGO-Virgo, set a new milestone in multi-messenger astronomy. It enabled an unprecedented follow-up campaign of the event that allowed the identification and monitoring of the source. With improved sensitivities, several of these events are expected to be detected in the next observation run of LIGO-Virgo, starting early 2019. Given the NSM horizon for O3, very high energy transient counterparts may be observed. In this context, the HAWC observatory, sensitive to very high energy gamma rays between ~0.3-100TeV, is well suited to look for GW counterparts due to its large field of view and ~95% duty cycle. We will show preliminary results on TeV gamma ray and gravitational wave transient analysis in the context of the Astrophysical Multi-messenger Observatory Network (AMON). AMON has already shown its capabilities to perform coincidence analysis by the combination of sub-threshold neutrino, cosmic-ray, gamma-rays. The potential inclusion of gravitational waves is ongoing and subject of this contribution. We will present a novel likelihood ratio framework analysis, discuss the advantages of using astrophysical distribution of galaxies and the real time response of AMON in the next observation run O3.
Mrs Monica Seglar Arroyo (CEA)