GCN Circular 26805
Subject
IceCube-200117A: Upper limits from Fermi-GBM Observations
Date
2020-01-17T17:17:17Z (5 years ago)
From
Joshua Wood at MSFC/Fermi-GBM <joshua.r.wood@nasa.gov>
J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM team:
For the IceCube high-energy neutrino candidate event 200117A (GCN 26802), at the event time Fermi-GBM was observing the reported neutrino location at:
RA: 116.24 (+0.71 -1.24 deg 90% PSF containment) J2000
Dec: 29.14 (+0.90 -0.78 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-200117A.
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: 4.5 7.7 15.
1.024 s: 0.9 1.7 3.4
8.192 s: 0.4 0.5 0.8