Proposal for INTEGRAL ToO observations of Cosmic Neutrino transients

Since 2016, the IceCube collaboration is distributing alerts of highenergyneutrino detections in order to allow followup searches for possiblecounterparts. Finding them would provide important clues on the origin of thehighenergy neutrinos and on the nature of the highenergy cosmic rayaccelerators. We ask for pointed ToO observation of the High Energy StartingEvents and Extremely High Energy neutrinos detected by IceCube and reported inGCNs. We will employ the best available knowledge of the INTEGRAL instruments tohunt for a possible hard Xray and gammaray counterparts. In absence of adetection, we will set the most stringent upper limits. We intend to promptlycommunicate the results of our ToOs to the general community, thus supporting additional multiwavelength followups. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]