GRB 221009A is the brightest Gamma Ray Burst (GRB) ever observed. The
observed extremely high flux of high and very-high-energy photons provide a
unique opportunity to probe the predicted neutrino counterpart to the
electromagnetic emission. We have used a variety of methods to search for
neutrinos in coincidence with the GRB over several time windows during the
precursor, prompt and afterglow phases of the GRB. MeV scale neutrinos are
studied using photo-multiplier rate scalers which are normally used to search
for galactic core-collapse supernovae neutrinos. GeV neutrinos are searched
starting with DeepCore triggers. These events don't have directional
localization, but instead can indicate an excess in the rate of events. 10 GeV
- 1 TeV and >TeV neutrinos are searched using traditional neutrino point source
methods which take into account the direction and time of events with DeepCore
and the entire IceCube detector respectively. The >TeV results include both a
fast-response analysis conducted by IceCube in real-time with time windows of
T0ββ1 to T0β+2 hours and T0βΒ±1 day around the time of GRB
221009A, as well as an offline analysis with 3 new time windows up to a time
window of T0ββ1 to T0β+14 days, the longest time period we consider.
The combination of observations by IceCube covers 9 orders of magnitude in
neutrino energy, from MeV to PeV, placing upper limits across the range for
predicted neutrino emission.Comment: Presented at the 38th International Cosmic Ray Conference (ICRC2023).
See arXiv:2307.13047 for all IceCube contribution