Constraints on the Ultra-High Energy Neutrino Flux from Gamma-Ray Bursts from a Prototype Station of the Askaryan Radio Array

Understand

We report on a search for ultra-high-energy (UHE) neutrinos from gamma-ray bursts (GRBs) in the data set collected by the Testbed station of the Askaryan Radio Array (ARA) in 2011 and 2012.

• From 57 selected GRBs, we observed no events that survive our cuts, which is consistent with 0.12 expected background events.
• Using NeuCosmA as a numerical GRB reference emission model, we estimate upper limits on the prompt UHE GRB neutrino fluence and quasi-diffuse flux from $10^{7}$ to $10^{10}$ GeV.
• This is the first limit on the prompt UHE GRB neutrino quasi-diffuse flux above $10^{7}$ GeV.