Multiwavelength follow-up of a rare IceCube neutrino multiplet
Creators: name: Aartsen, M. G.
name: Ackermann, M.
name: Adams, J.
name: Aguilar, J. A.
name: Ahlers, M.
name: Ahrens, M.
name: Samarai, I. Al
name: Altmann, D.
name: Andeen, K.
name: Anderson, T.
name: Ansseau, I.
name: Anton, G.
name: Archinger, M.
name: Argüelles, C.
name: Auffenberg, J.
name: Axani, S.
name: Bai, X.
name: Barwick, S. W.
name: Baum, V.
name: Bay, R.
name: Beatty, J. J.
name: Tjus, J. Becker
name: Becker, K. -H.
name: BenZvi, S.
name: Berley, D.
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name: Binder, G.
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name: Blot, S.
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name: Botner, O.
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name: Bretz, H. -P.
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name: Casier, M.
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name: de, J. P. A. M.
name: Ré
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name: Rosendo, E. del Pino
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name: Desiati, P.
name: de Vries, K. D.
name: de Wasseige, G.
name: de With, M.
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name: di Lorenzo, V.
name: Dujmovic, H.
name: Dumm, J. P.
name: Dunkman, M.
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Publisher: name: arXiv
Year: 2017
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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.
description: 23 pages, 13 figures, accepted by A&amp;A on July 30 2017