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2025ApJ...981..192A - Astrophys. J., 981, 192 (2025/March-2)

Limits on the Low-energy Electron Antineutrino Flux from the Brightest Gamma-Ray Burst of All Time.

ABE S., ARAKI T., CHAUHAN S., CHIBA K., EDA T., EIZUKA M., FUNAHASHI Y., FURUTO A., GANDO A., GANDO Y., GOTO S., HACHIYA T., HATA K., ICHIMURA K., IKEDA H., INOUE K., ISHIDOSHIRO K., KAMEI Y., KAWADA N., KISHIMOTO Y., KOGA M., MARTHE A., MATSUMOTO Y., MITSUI T., MIYAKE H., MORITA D., NAKAJIMA R., NAKAMURA K., NAKAMURA R., NAKAMURA R., NAKANE J., ONO T., OZAKI H., SAITO K., SAKAI T., SHIMIZU I., SHIRAI J., SHIRAISHI K., SUZUKI A., TACHIBANA K., TAMAE K., WATANABE H., WATANABE K., KUROSAWA S., URANO Y., YOSHIDA S., UMEHARA S., FUSHIMI K., KOTERA K., BERGER B.E., FUJIKAWA B.K., LEARNED J.G., MARICIC J., FU Z., GHOSH S., SMOLSKY J., WINSLOW L.A., EFREMENKO Y., KARWOWSKI H.J., MARKOFF D.M., TORNOW W., DELL'ORO S., O'DONNELL T., DETWILER J.A., ENOMOTO S., DECOWSKI M.P., WEERMAN K.M., GRANT C., PENEK O., SONG H., LI A., AXANI S.N., GARCIA M., SARFRAZ M. (The KamLAND Collaboration)

Abstract (from CDS):

The electron antineutrino flux limits are presented for the brightest gamma-ray burst (GRB) of all time, GRB221009A, over a range of 1.8-200 MeV using the Kamioka Liquid Scintillator Antineutrino Detector. Using multiple time windows ranging from minutes to days surrounding the event to search for electron antineutrinos coincident with the GRB, we set an upper limit on the flux under the assumption of several power-law neutrino source spectra, with power-law indices ranging from 1.5 to 3 in steps of 0.5. No excess was observed in any time windows ranging from seconds to days around the event trigger time T0. For a power-law index of 2 and a time window of T0 ± 500 s, a flux upper limit of 2.34 × 109 cm–2 was calculated. The limits are compared to the results presented by IceCube.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-ray bursts - Neutrino astronomy

Simbad objects: 1

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