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GCN Circular 28584

Subject

IceCube-201007A: Upper limits from Fermi-GBM Observations

Date

2020-10-08T23:11:36Z (4 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 IceCube-201007A
(GCN 28575Not found
 
 
), at the event time Fermi-GBM was observing the reported
neutrino location at:

RA: 265.17 (+/- 0.52 deg  90% PSF containment) J2000
Dec: 5.34 ((+0.32, -0.23) 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-201007A.

We set upper limits on impulsive gamma-ray emission. Using the
representative soft, normal, and hard GRB-like templates described in
arXiv:1612.02395Not found
 
 
, 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:    5.7      8.4      14.
1.024 s:    1.7      3.3      4.7
8.192 s:    0.6      1.1      1.8

These results are preliminary.