TITLE: GCN CIRCULAR NUMBER: 23811 SUBJECT: Fermi GBM Observations of IceCube-190124A DATE: 19/01/29 21:55:38 GMT FROM: Adam Goldstein at Fermi-GBM, USRA A. Goldstein (USRA), R. Hamburg (UAH), and C.M. Hui (NASA/MSFC) report on behalf of the Fermi GBM team: “We have searched the Fermi Gamma-ray Burst Monitor data for gamma-ray counterpart to IceCube-190124A (GCN 23785). The closest onboard trigger occurred approximately 1 hour prior to the neutrino event time and was identified as a terrestrial gamma-ray flash unassociated with the neutrino. The ground-based untargeted search of GBM data did not find any significant candidates within +/- 1 hour of the event time. The targeted search ([1],[2]) was also run +/- 150 s around the event time, and no significant candidates were found. We set the following impulsive 3 sigma flux upper limits (10-1000 keV) in a 300 s window around the neutrino time based on various GRB spectra, ranging from soft to hard spectra. Timescale Upper limit (erg/s/cm^2) ----------------------------------- 1 s : 1.6 - 7.5 (e-07) 10 s : 5.0 - 23.4 (e-08) 100 s: 1.6 - 7.5 (e-08) [1] L. Blackburn et al. 2015, ApJS 217, 8 [2] A. Goldstein et al. arXiv:1612.02395 "