Identifying High Energy Neutrino Transients by Neutrino Multiplet-Triggered Followups

Abstract

Transient sources such as supernovae (SNe) and tidal disruption events are candidates of high energy neutrino sources. However, SNe commonly occur in the universe and a chance coincidence of their detection with a neutrino signal cannot be avoided, which may lead to a challenge of claiming their association with neutrino emission. In order to overcome this difficulty, we propose a search for $\sim 10-100$ TeV neutrino multiple events within a timescale of $\sim 30$ days coming from the same direction, called neutrino multiplets. We show that demanding multiplet detection by a $\sim 1$ km${}^3$ neutrino telescope limits distances of detectable neutrino sources, which enables us to identify source counterparts by multiwavelength observations owing to the substantially reduced rate of the chance coincidence detection of transients. We apply our results by constructing a feasible strategy for optical followup observations and demonstrate that wide-field optical telescopes with a $\gtrsim 4$ m dish should be capable of identifying a transient associated with a neutrino multiplet. We also present the resultant sensitivity of multiplet neutrino detection as a function of the released energy of neutrinos and burst rate density. A model of neutrino transient sources with an emission energy greater than $\mathrm{a}\mathrm{few}\times 10^{51}$erg and a burst rate rarer than $\mathrm{a}\mathrm{few}\times 10^{-8}{\mathrm{Mpc}}^{-3}{\mathrm{yr}}^{-1}$ is constrained by the null detection of multiplets by a $\sim 1$km${}^3$ scale neutrino telescope. This already disfavors the canonical high-luminosity gamma ray bursts and jetted tidal disruption events as major sources in the TeV-energy neutrino sky.

The version accepted for publication in ApJ

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