Follow up of the IceCube alerts with the Baikal-GVD telescope
V. A. Allakhverdyan, A. D. Avrorin, A. V. Avrorin, V. M. Aynutdinov,, R. Bannasch, Z. Barda\v{c}ov\'a, I. A. Belolaptikov, I. V. Borina, V. B., Brudanin, N. M. Budnev, V. Y. Dik, G. V. Domogatsky, A. A. Doroshenko, R., Dvornick\'y, A. N. Dyachok, Zh.-A. M. Dzhilkibaev
TL;DR
This study reports on the follow-up observations of IceCube high-energy neutrino alerts by the Baikal-GVD telescope, aiming to find correlated neutrino events but finding no significant excess, and setting upper limits on neutrino fluence.
Contribution
First coordinated follow-up of IceCube alerts with Baikal-GVD in a quasi-online mode, providing constraints on neutrino emission from astrophysical sources.
Findings
No statistically significant correlation found.
Upper limits on neutrino fluence established.
Follow-up mode demonstrated effective for real-time neutrino monitoring.
Abstract
The high-energy muon neutrino events of the IceCube telescope, that are triggered as neutrino alerts in one of two probability ranks of astrophysical origin, "gold" and "bronze", have been followed up by the Baikal-GVD in a fast quasi-online mode since September 2020. Search for correlations between alerts and GVD events reconstructed in two modes, muon-track and cascades (electromagnetic or hadronic showers), for the time windows 1 h and 12 h does not indicate statistically significant excess of the measured events over the expected number of background events. Upper limits on the neutrino fluence will be presented for each alert.
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