Fast Identification of Transients: Applying Expectation Maximization to Neutrino Data

We present a novel method for identifying transients suitable for both strong signal-dominated and background-dominated objects. By employing the unsupervised machine learning algorithm known as Expectation Maximization, we achieve computing time reductions of over ${10}^4$ on a single CPU compared to conventional brute-force methods. Furthermore, this approach can be readily extended to analyze multiple flares. We illustrate the algorithm’s application by fitting the IceCube neutrino flare of TXS 0506+056.