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T: Fachverband Teilchenphysik

T 8: Neutrino astronomy I

T 8.2: Talk

Monday, March 30, 2020, 16:50–17:05, H-HS VI

Studies of systematic uncertainty effects on IceCube's real-time angular uncertainty — •Cristina Lagunas Gualda for the IceCube collaboration — DESY Zeuthen

Sources of astrophysical neutrinos can be potentially discovered through the detection of neutrinos in coincidence with electromagnetic or gravitational waves. Real-time alerts generated by IceCube play an important role in this search since they act as a trigger for follow-up observations with more sensitive instruments.

Once a high-energy event is detected by the IceCube real-time program, an automatic GCN notice is generated within the first tens of second using a fast and crude reconstruction method. Then a more sophisticated and time-consuming method is run in order to calculate a more accurate localization and uncertainty estimate including an estimate on systematic uncertainties. There is a discrepancy between the spatial uncertainty contours from the two methods with the latter once being significantly larger.

To investigate this discrepancy and especially the effect of systematic uncertainties, we focus on individual high-energy events and simulate similar events in direction and energy for different ice model realizations. This makes use of a novel simulation tool, which allows the treatment of systematic uncertainties with multiple and continuously varied nuisance parameters.