GCN Circular 25404
Subject
IceCube-190819A: Upper limits from Fermi-GBM Observations
Date
2019-08-19T22:59:26Z (6 years ago)
From
Joshua Wood at MSFC/Fermi-GBM <joshua.r.wood@nasa.gov>
J. Wood, M. Hui, and D. Kocevski (NASA/MSFC) report on behalf of the Fermi-GBM Team:
For the IceCube high-energy neutrino candidate event 190819A (GCN 25402), at the event time Fermi-GBM was observing the reported neutrino location at:
RA: 148.80 (+2.07 -3.24 deg 90% PSF containment) J2000
Dec: 1.38 (+1.00 -0.75 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-190819A.
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 norm hard
--------------------------------------
0.128 s: 4.1 5.9 12.
1.024 s: 1.5 2.1 4.6
8.192 s: 0.5 0.9 1.5