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

Alves Garre, S.; Versari, F.; Avrorin, A. D.; Dzhlkibaev, Z. -A. M.; Shelepov, M. D.; Suvorova, O. V.; Albert, A.; Alves, S.; Andre, M.; Anghinolfi, M.; Anton, G.; Ardid, M.; Ardid, S.; Aubert, J. -J.; Aublin, J.; Baret, B.; Basa, S.; Belhorma, B.; Bendahman, M.; Bertin, V.; Biagi, S.; Bissinger, M.; Boumaaza, J.; Bouta, M.; Bouwhuis, M. C.; Branzas, H.; Bruijn, R.; Brunner, J.; Busto, J.; Caiffi, B.; Capone, A.; Caramete, L.; Carr, J.; Carretero, V.; Celli, S.; Chabab, M.; Chau, T. N.; El Moursli, R. C.; Chiarusi, T.; Circella, M.; Coleiro, A.; Colomer-Molla, M.; Coniglione, R.; Coyle, P.; Creusot, A.; Diaz, A. F.; de Wasseige, G.; Deschamps, A.; Distefano, C.; Di Palma, I.; Domi, A.; Donzaud, C.; Dornic, D.; Drouhin, D.; Eberl, T.; van Eeden, T.; van Eijk, D.; El Khayati, N.; Enzenhofer, A.; Fermani, P.; Ferrara, G.; Filippini, F.; Fusco, L. A.; Gatelet, Y.; Gay, P.; Glotin, H.; Gozzini, R.; Gracia Ruiz, R.; Graf, K.; Guidi, C.; Hallmann, S.; van Haren, H.; Heijboer, A. J.; Hello, Y.; Hernandez-Rey, J. J.; Hossl, J.; Hofestadt, J.; Huang, F.; Illuminati, G.; James, C. W.; Jisse-Jung, B.; de Jong, M.; de Jong, P.; Kadler, M.; Kalekin, O.; Katz, U.; Khan-Chowdhury, N. R.; Kouchner, A.; Kreykenbohm, I.; Kulikovskiy, V.; Lahmann, R.; Le Breton, R.; Lefevre, D.; Leonora, E.; Levi, G.; Lincetto, M.; Lopez-Coto, D.; Loucatos, S.; Maderer, L.; Manczak, J.; Marcelin, M.; Margiotta, A.; Marinelli, A.; Martinez-Mora, J. A.; Melis, K.; Migliozzi, P.; Moussa, A.; Muller, R.; Nauta, L.; Navas, S.; Nezri, E.; O'Fearraigh, B.; Paun, A.; Pavalas, G. E.; Pellegrino, C.; Perrin-Terrin, M.; Pestel, V.; Piattelli, P.; Pieterse, C.; Poire, C.; Popa, V.; Pradier, T.; Randazzo, N.; Reck, S.; Riccobene, G.; Romanov, A.; Sanchez-Losa, A.; Salesa Greus, F.; Samtleben, D. F. E.; Sanguineti, M.; Sapienza, P.; Schnabel, J.; Schumann, J.; Schussler, F.; Spurio, M.; Stolarczyk, Th.; Taiuti, M.; Tayalati, Y.; Tingay, S. J.; Vallage, B.; Van Elewyck, V.; Versari, F.; Viola, S.; Vivolo, D.; Wilms, J.; Zavatarelli, S.; Zegarelli, A.; Zornoza, J. D.; Zuniga, J.; Allakhverdyan, V. A.; Avrorin, A. D.; Avrorin, A. V.; Aynutdinov, V. M.; Bannasch, R.; Bardacova, Z.; Belolaptikov, I. A.; Borina, I. V.; Brudanin, V. B.; Budnev, N. M.; Dik, V. Y.; Domogatsky, G. V.; Doroshenko, A. A.; Dvornicky, R.; Dyachok, A. N.; Dzhilkibaev, Zh. -A. M.; Eckerova, E.; Elzhov, T. V.; Fajt, L.; Fialkovski, S. V.; Gafarov, A. R.; Golubkov, K. V.; Gorshkov, N. S.; Gress, T. I.; Katulin, M. S.; Kebkal, K. G.; Kebkal, O. G.; Khramov, E. V.; Kolbin, M. M.; Konischev, K. V.; Kopanski, K. A.; Korobchenko, A. V.; Koshechkin, A. P.; Kozhin, V. A.; Kruglov, M. V.; Kryukov, M. K.; Kulepov, V. F.; Malecki, Pa.; Malyshkin, Y. M.; Milenin, M. B.; Mirgazov, R. R.; Naumov, D. V.; Nazari, V.; Noga, W.; Petukhov, D. P.; Pliskovsky, E. N.; Rozanov, M. I.; Rushay, V. D.; Ryabov, E. V.; Safronov, G. B.; Shaybonov, B. A.; Shelepov, M. D.; Simkovic, F.; Sirenko, A. E.; Skurikhin, A. V.; Solovjev, A. G.; Sorokovikov, M. N.; Stekl, I.; Stromakov, A. P.; Sushenok, E. O.; Suvorova, O. V.; Tabolenko, V. A.; Tarashansky, B. A.; Yablokova, Y. V.; Yakovlev, S. A.; Zaborov, D. N.

ANTARES and Baikal-GVD are both Cherenkov neutrino telescopes located in the Northern Hemisphere so 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 of 2018 until the beginning of 2021, Baikal-GVD received 38 ANTARES alerts, and followed up 32. No coincidence was found. However, a search of 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. 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. In this work we present the final results of the offline analysis of the three ANTARES alerts: limits on the astrophysical neutrino fluence are reported.