Speaker
Dr
Dariusz Gora
(Institute of Nuclear Physics Polish Academy of Sciences, Cracow, Poland)
Description
MAGIC is a stereoscopic system of two Imaging Atmospheric Cherenkov Telescopes, designed for the measurement of very high energy gamma rays above 30 GeV. MAGIC can also be used as a detector of PeV-EeV tau neutrinos: an optimal region of pointing is accessible through the Earth-skimming technique. This region is located towards the Atlantic Ocean, a few degrees below the horizon.
In this work, a follow-up approach is presented and exploited for high significance triggers issued by neutrino telescopes, such as IceCube. A selection cut is used in order to discriminate $\tau$-lepton-induced air showers from the background of very inclined cosmic-ray-induced air showers. The background rejection capability and the acceptance of MAGIC to $\nu_\tau$ are shown. The method presented here is applied to a sample of data collected during two consecutive nights (2019/08/01-02) after the trigger of a high-energy neutrino candidate event: IceCube-190730A (GCN # 25225). Given the spatial coincidence with the Flat Spectrum Radio Quasar PKS 1502+106 (within the 50% uncertainty region of the refined neutrino direction) and the high signalness reported for the neutrino candidate event (67%, ATel # 12967), we tracked the FSRQ while passing through the optimal neutrino visibility window. An upper limit on the neutrino flux from the above given direction is presented.
Primary authors
Dr
Dariusz Gora
(Institute of Nuclear Physics Polish Academy of Sciences, Cracow, Poland)
Prof.
Elisa Bernardini
(University of Padova, INFN Padova (Italy), DESY, Zeuthen, (Germany))
Dr
Manuela Mallamaci
(University of Padova and INFN Padova (Italy))
