TITLE: GCN CIRCULAR NUMBER: 24917 SUBJECT: IceCube-190629A: Upper limits from Fermi-GBM Observations DATE: 19/06/30 13:27:38 GMT FROM: Rachel Hamburg at UAH J. Wood (NASA) and R. Hamburg (UAH) report on behalf of the Fermi-GBM Team: For the IceCube high-energy neutrino candidate event 190629A (GCN 24910), at the event time Fermi-GBM was observing the reported neutrino location at: RA = 27.22 (Dec value too close to pole for accurate error on RA) J2000 DEC = 84.33 (+4.95/-3.13 deg 90% PSF containment) J2000 There was no Fermi-GBM onboard trigger around the event time of the neutrino candidate. An automated, blind search for gamma -ray transients below the onboard triggering threshold in Fermi- GBM also identified no counterpart candidates +/- 1 hour of event time. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around the neutrino candidate time. The most significant result from this search was found T0+12 s on the longest timescale of ~10 s and was best fit with the "normal" spectral template described in arXiv:1612.02395. The GBM localization is centered at RA, DEC = (123.8, 25.0) with a 90% credible region spanning 10,084 square degrees. Modelling the neutrino localization as a Gaussian with a width of 3 degrees and centered at the coordinates reported by IceCube, we find the spatial consistency between the localizations to be 1.8%. We therefore consider this signal likely unrelated to IceCube-190629A. We set upper limits on impulsive gamma-ray emission. Using the representative soft, normal, and hard GRB-like templates (arXiv:1612.02395), we report the following 3 sigma flux upper limits over 10-1000 keV (in units of 10^-7 erg/s/cm^2): Timescale Soft Normal Hard ------------------------------------ 0.128 s: 7.6e-07 8.6e-07 1.5e-06 1.024 s: 1.4e-07 2.7e-07 6.1e-07 8.192 s: 6.8e-08 1.3e-07 2.6e-07