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GCN Circular 28894

IceCube-201114A: Upper limits from Fermi GBM Observations
2020-11-15T18:37:40Z (4 years ago)
Suraj Poolakkil at UAH <>
For the IceCube high-energy neutrino candidate event IceCube-201114A
(GCN 28887), at the event time Fermi-GBM was observing the reported
neutrino location at:

RA: 105.25 (+ 1.28 - 1.12  deg  90% PSF containment) J2000
Dec: 6.05 (+ 0.95 - 0.95 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-201114A.

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:    11.0     12.0     17.0
1.024 s:    7.7      7.1      6.7
8.192 s:    3.1      2.5      2.2

These results are preliminary.
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