DESY Science Communication Lab
In October 2019, the IceCube Collaboration detected a muon track neutrino, IC191001A, with high probability of being of astrophysical origin. Soon after, the tidal disruption event (TDE) AT2019dsg, observed by the Zwicky Transient Facility, was indicated as the most likely counterpart of the IceCube track. Using the data collected since the discovery of the TDE (April 2019), ANTARES has investigated the location of AT2019dsg (Right Ascension =314.26°, Declination = 14.20°) to search for spatial clustering of events above the known background expectation following an unbinned maximum likelihood ratio approach.
As shown in the figure below, only one ANTARES event has been detected within 5° from the TDE. The result is consistent with background, yielding an upper limit on the one-flavour neutrino flux normalization for a Eν-2 neutrino spectrum of 1.0 x 10-7 GeV-1 cm-2 s-1.
Distribution of ANTARES events in equatorial coordinates around the position of AT2019dsg. The orange solid lines depict the one and five degree distance from the source position, indicated as a grey star. Only one track event (blue point) has been detected within 5 from the TDE. The dashed blue circle around the event location indicates the angular error estimate on the reconstructed direction.