Computers inside the IceCube laboratory constantly monitor the messages from the DOM light sensors. When predefined conditions indicate a passing particle has been detected, the data are stored. This happens almost 3000 times per second. Once or twice a month, a very high energy neutrino event is seen. Within a minute , an alert is sent to world-wide observatories so they can detect exotic astrophysical objects in flaring or otherwise active states. This happened on September 17, 2017, with the blazar TXS0506+056.
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