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    Aguilar, J. A.; Al Samarai, I.; Baum, V.; Bay, R.; Beatty, J. J.; Binder, G.; Böser, S.; Botner, O.; Braun, J.; Bron, S.; Casier, M.; Chirkin, D.; Clark, K.; Coenders, S.; de André, J. P. A. M.; de With, M.; Dunkman, M.; Euler, S.; Flis, S.; Fösig, C.-C.; Gallagher, J.; Hansen, E.; Hellauer, R.; Kauer, M.; Kiryluk, J.; Kohnen, G.; Kopper, C.; Kowalski, M.; Kurahashi, N.; Labare, M.; Lu, L.; Menne, T.; Merino, G.; Naumann, U.; Nygren, D. R.; Pankova, D. V.; Peiffer, P.; Pérez de los Heros, C.; Pinat, E.; Reimann, R.; Robertson, S.; Rysewyk, D.; Sanchez Herrera, S. E.; Schoenen, S.; Soldin, D.; Sullivan, G. W.; Tilav, S.; Turcati, A.; Vanheule, S.; Vehring, M.; Voge, M.; Walck, C.; Westerhoff, S.; Wickmann, S.; Wiebe, K.; Zoll, M.; Shappee, B. J.; Lien, A. Y.; Arceo, R.; Becerril, A.; Belmont-Moreno, E.; Brisbois, C.; Caballero-Mora, K. S.; Carramiñana, A.; Fiorino, D. W.; Goodman, J. A.; Hampel-Arias, Z.; Hernandez, S.; Jardin-Blicq, A.; Kaufmann, S.; Lauer, R. J.; Lee, W. H.; Lennarz, D.; López-Coto, R.; Marinelli, S. S.; Martínez-Huerta, H.; Mostafá, M.; Rivière, C.; Salesa Greus, F.; Schoorlemmer, H.; Tollefson, K.; Villaseñor, L.; Arcavi, I.; Howell, D. A.; Gorbovskoy, E. S.; Evans, P. A.; Osborne, J. P.; Brantseg, T.; Fleischhack, H.; Grube, J.; Hütten, M.; Holder, J.; Kumar, S.; Nieto, D.; Popkow, A.; Pueschel, E.; Quinn, J.; Richards, G. T.; Roache, E.; Wakely, S. P.

    Astronomy and astrophysics (Berlin), 11/2017, Letnik: 607, Številka: Nov. 2017
    Journal Article

    On February 17, 2016, the IceCube real-time neutrino search identified, for the first time, three muon neutrino candidates arriving within 100 s of one another, consistent with coming from the same point in the sky. Such a triplet is expected once every 13.7 years as a random coincidence of background events. However, considering the lifetime of the follow-up program the probability of detecting at least one triplet from atmospheric background is 32%. Follow-up observatories were notified in order to search for an electromagnetic counterpart. Observations were obtained by Swift’s X-ray telescope, by ASAS-SN, LCO and MASTER at optical wavelengths, and by VERITAS in the very-high-energy gamma-ray regime. Moreover, the Swift BAT serendipitously observed the location 100 s after the first neutrino was detected, and data from the Fermi LAT and HAWC observatory were analyzed. We present details of the neutrino triplet and the follow-up observations. No likely electromagnetic counterpart was detected, and we discuss the implications of these constraints on candidate neutrino sources such as gamma-ray bursts, core-collapse supernovae and active galactic nucleus flares. This study illustrates the potential of and challenges for future follow-up campaigns.