How do you calibrate a probe that is sealed inside a giant liquid-argon neutrino detector?
Hawaii
From Astronomy, Feb. 22, 2018: The supernova, dubbed DES16C2nm, was first detected back in August 2016 by the Dark Energy Survey, which is currently mapping several hundred million galaxies in order to learn more about the mysterious force known as dark energy.
From Newsweek, Feb. 21, 2018: DES162nm was first spotted in August 2016 using the Cerro Tololo Inter-American Observatory in Chile. The investigations were part of an international collaboration known as the Dark Energy Survey—a project designed to map hundreds of millions of galaxies in a search for the mysterious force that is thought to be behind the accelerating expansion of the universe.