First all-flavor search for transient neutrino emission using 3-years of IceCube DeepCore data

Since the discovery of a flux of high-energy astrophysical neutrinos, searches for their origins have focused primarily at TeV-PeV energies. Compared to sub-TeV searches, high-energy searches benefit from an increase in the neutrino cross section, improved angular resolution on the neutrino direction, and a reduced background from atmospheric neutrinos and muons. However, the focus on high energy does not preclude the existence of sub-TeV neutrino emission where IceCube retains sensitivity. Here we present the first all-flavor search from IceCube for transient emission of low-energy neutrinos, focusing on the energy region of 5.6-100 GeV using three years of data obtained with the IceCube-DeepCore detector. We find no evidence of transient neutrino emission in the data, thus leading to a constraint on the volumetric rate of astrophysical transient sources in the range of ~ 705-2301 Gpc^-3 yr^-1 for sources following a subphotospheric energy spectrum with a mean energy of 100 GeV and a bolometric energy of 1⁰⁵² erg.. Authors: Abbasi, R.; Ackermann, M.; Adams, J.; Aguilar, J. A.; Ahlers, M.. DOE Contract: AC02-05CH11231. Subjects: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS