SGR 1935+2154 bursts: IceCube neutrino search
ATel #13689; Justin Vandenbroucke (University of Wisconsin)
on 29 Apr 2020; 23:05 UT
Credential Certification: Justin Vandenbroucke (justin.vandenbroucke@wisc.edu)
Subjects: Neutrinos, Soft Gamma-ray Repeater
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search for track-like muon neutrino events arriving from the direction of SGR 1935+2154 (ATel #13675, #13678, #13679, #13681, #13682, #13685, #13686, GCN #27657, #27661) in a time window of 1 day in duration beginning prior to the initial trigger from the Swift BAT (2020-04-27 18:00:00 UTC to 2020-04-28 18:00:00 UTC), during which IceCube was collecting good quality data. One track-like event (detected at 2020-04-27 19:23:30.9 UTC) is found in spatial coincidence with SGR 1935+2154 during this time period. We find that these data are consistent with atmospheric background expectations, with a p-value of 0.033. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 5.2 x 10^-5 TeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum are between approximately 1 TeV and 1 PeV.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.
