PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - MM - Multi-Messenger
Model independent search for transient multimessenger events with AMON using outlier detection methods
T. Grégoire*, H. Ayala Solares, S. Coutu, D. Cowen, J. DeLaunay, D.B. Fox, A. Keivani, F. Krauss, M. Mostafa, K. Murase, E. Neight, C. Turley  on behalf of the AMON Project
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Pre-published on: July 03, 2021
Published on: March 18, 2022
The Astrophysical Multimessenger Observatory Network (AMON) receives subthreshold data from multiple observatories in order to look for coincidences. Combining more than two datasets at the same time is challenging because of the range of possible signals (time windows, energies, number of events…). However, outlier detection methods can circumvent this issue by identifying any signal divergent from the background (e.g.\ scrambled data).

We propose to use these methods to make a model independent combination of the subthreshold data of neutrino and gamma ray experiments. Using the python outlier detection (PyOD) package, it allows us to test several methods from a simple ``k-nearest neighbours'' algorithm to a more sophisticated Generative Adversarial Active Learning neural networks which generates data points to better discriminate inliers from outliers.
DOI: https://doi.org/10.22323/1.395.0934
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