MAGIC as a neutrino follow-up instrument

Since 2012, the stereoscopic IACT system MAGIC, located on La Palma, Canary Islands, has been involved in neutrino follow-up campaigns. The MAGIC telescopes are sensitive to gamma events with energies between 30 GeV and tens of TeV. In 2017 MAGIC detected for the first time very high energy gamma-ray emission from the blazar TXS 0506+056, spatially and temporally correlated with a high-energy neutrino event observed by IceCube. Every time a potentially astrophysical neutrino is detected by IceCube, an alert with the reconstructed coordinates is published. MAGIC uses its automated alert response system and performs follow-up observations in search of a correlated gamma-ray flux. The reconstructed neutrino direction is given with an uncertainty, typically about 0.2°-1°Since the MAGIC angular resolution is much smaller, the analysis needs to be modified to detect sources in a certain sky region. Here we present a method for creating sky maps to identify point sources for the desired sky region, based on a maximum likelihood approach included in the SkyPrism software. Analysis results of the follow-up observation of the neutrino event HESE-160427A performed by MAGIC in April 2016 are shown.