[vsnet-grb-info 25857] IceCube-200615A: Upper limits from Fermi-GBM Observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Tue Jun 16 05:33:26 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 27957
SUBJECT: IceCube-200615A: Upper limits from Fermi-GBM Observations
DATE: 20/06/15 20:31:57 GMT
FROM: Joshua Wood at MSFC/Fermi-GBM <joshua.r.wood at nasa.gov>
J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM team:
For the IceCube high-energy neutrino candidate event IceCube-200615A
(GCN 27950), at the event time Fermi-GBM was observing the reported
neutrino location at:
RA: 142.95 (+1.18 -1.45 deg 90% PSF containment) J2000
Dec: 3.66 (+1.19 -1.06 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-200615A.
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: 7.5 11. 26.
1.024 s: 1.8 2.9 6.4
8.192 s: 0.4 0.9 2.2
These results are preliminary.
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