ANTARES offline study of three alerts after Baikal-GVD follow-up found coincident cascade neutrino events

Discussion timeslot (ZOOM-Meeting): 16. July 2021 - 18:00
ZOOM-Meeting URL: https://icrc2021.desy.de/pf_access_abstracts
Corresponding Session: https://icrc2021-venue.desy.de/channel/Presenter-Forum-1-Evening-All-Categories/48
Abstract:
'ANTARES and Baikal-GVD are both Cherenkov neutrino telescopes located in the Northern Hemisphere. As a consequence, their fields of view almost overlap allowing for a combined study of the sky. ANTARES sends alerts after a fast online analysis based on energy and reconstruction direction of track-like events. From December 2018 until the beginning of 2021, Baikal-GVD received 38 ANTARES alerts, and followed up a total of 32.

No prompt coincidence was found. However, a search into the Baikal-GVD cascade sample showed some events falling within an angular distance of less than 5° for three of the ANTARES alerts in a time span of 48 hours. The 4.5° angular resolution of Baikal-GVD allows for the possibility of these events to be spatially correlated, which makes them of special interest. A dedicated offline analysis based on the full ANTARES data sample has been started to search for additional coincident tracks and cascades at a 3σ significance. With this contribution we present the final results on the offline analysis of the three ANTARES alerts: limits on the astrophysical neutrino fluence are reported.'

Authors: Sergio Alves Garre

Collaboration: ANTARES and Baikal-GVD

Indico-ID: 529
Proceeding URL: https://pos.sissa.it/395/1121