2021/12/31 by S. Abe, S. Asami, A. Gando +74 · 4 citations
Physics and Astronomy · #Astrophysics #Astrophysics and Cosmic Phenomena #Coincidence #Detector #Electron #Electron neutrino #Fermi Gamma-ray Space Telescope #Galaxy #Gamma ray #Gamma-ray burst #Gamma-ray bursts and supernovae #Luminosity #Neutrino #Neutrino Physics Research #Neutrino oscillation #Nuclear physics #Optics #Physics #Redshift #astro-ph.HE #hep-ex
paper · pdf · open access · doi:10.3847/1538-4357/ac4e7e
published in The Astrophysical Journal 927(1), 69 (IOP Publishing) · 9 pages, 3 figures
openalex created_date 2021/12/31 · arxiv created 2022/01/24 · openalex publication_date 2022/03/01 · arxiv updated 2022/03/14 · openalex updated_date 2026/08/06
We present the results of a time-coincident event search for low-energy electron antineutrinos in the KamLAND detector with gamma-ray bursts from the Gamma-ray Coordinates Network and Fermi Gamma-ray Burst Monitor. Using a variable coincidence time window of ±500s plus the duration of each gamma-ray burst, no statistically significant excess above background is observed. We place the world's most stringent 90% confidence level upper limit on the electron antineutrino fluence below 17.5 MeV. Assuming a Fermi-Dirac neutrino energy spectrum from the gamma-ray burst source, we use the available redshift data to constrain the electron antineutrino luminosity and effective temperature.