Constraints on differential Shapiro delay between neutrinos and photons from IceCube-170922A Sibel Boran, Shantanu Desai and Emre O. Kahya Eur. Phys. J. C, 79 3 (2019) 185 Published online: 01 March 2019 DOI: 10.1140/epjc/s10052-019-6695-6