The IceCube Realtime Alert System
IceCube Collaboration: M. G. Aartsen, M. Ackermann, J. Adams, J. A., Aguilar, M. Ahlers, M. Ahrens, D. Altmann, K. Andeen, T. Anderson, I., Ansseau, G. Anton, M. Archinger, C. Arg\"uelles, J. Auffenberg, S. Axani, X., Bai, S. W. Barwick, V. Baum, R. Bay, J. J. Beatty

TL;DR
The paper describes the development and implementation of a real-time analysis and alert system for IceCube neutrino observatory to facilitate rapid follow-up observations aiming to identify astrophysical neutrino sources.
Contribution
It introduces a new real-time analysis framework and infrastructure at IceCube for prompt neutrino detection and alerts, enabling faster multi-messenger astronomy.
Findings
First real-time analyses activated within the framework.
System demonstrates sensitivity to astrophysical neutrinos.
Infrastructure supports rapid follow-up and future discoveries.
Abstract
Following the detection of high-energy astrophysical neutrinos in 2013, their origin is still unknown. Aiming for the identification of an electromagnetic counterpart of a rapidly fading source, we have implemented a realtime analysis framework for the IceCube neutrino observatory. Several analyses selecting neutrinos of astrophysical origin are now operating in realtime at the detector site in Antarctica and are producing alerts to the community to enable rapid follow-up observations. The goal of these observations is to locate the astrophysical objects responsible for these neutrino signals. This paper highlights the infrastructure in place both at the South Pole detector site and at IceCube facilities in the north that have enabled this fast follow-up program to be developed. Additionally, this paper presents the first realtime analyses to be activated within this framework,…
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