GCN Circular 26345
Subject
IceCube-191204A: Upper limits from Fermi-GBM Observations
Event
Date
2019-12-05T16:51:29Z (6 years ago)
From
C. Michelle Hui at MSFC/Fermi-GBM <c.m.hui@nasa.gov>
C. M. Hui (MSFC) and P. Veres (UAH) report on behalf of the Fermi-GBM team:
For the IceCube high-energy neutrino candidate event 191204A (GCN 26341), at the event time Fermi-GBM was observing the reported neutrino location at:
RA: 79.72 (+3.20 -1.74 deg 90% PSF containment) J2000
Dec: 2.80 (+1.12 -1.23 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 short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around the neutrino candidate time. From this search, no significant signal was found related to IceCube-191204A.
We set upper limits on impulsive gamma-ray emission. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set 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: 15 20 37
1.024 s: 3.4 4.4 12
8.192 s: 1.3 2.3 3.6