Speaker
Description
Optical transients with timescales of months, such as supernovae (SNe) and tidal disruption events (TDEs), are candidate sources of high-energy neutrinos. Multiple neutrino detections from the same direction on a timescale of about a month provide a unique opportunity to identify such optical counterparts in the nearby Universe. In this work, we conduct an archival search for the optical counterpart of an IceCube triplet event using data from the Zwicky Transient Facility. We develop a dedicated alert filtering system and validate its performance through a blind analysis. Applying this filtering system to the data after the detection of the IceCube triplet event, we find no transient candidates within the localization area. Assuming that the IceCube triplet event originates from an astrophysical source, we constrain the peak luminosity and decay timescale of the optical transient using a simple signal model motivated by TDEs and superluminous SNe (SLSNe). To place constraints on transients with rapidly evolving light curves, prompt follow-up observations for future neutrino multiplet events are crucial. We also discuss a follow-up strategy for upcoming real-time IceCube multiplet alerts.
