GCN Circular 27241
Subject
IceCube-200227A: Upper limits from Fermi-GBM Observations
Date
2020-02-27T17:28:58Z (4 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
C. Malacaria (NASA-MSFC/USRA) reports on behalf of the Fermi-GBM team:
For the IceCube high-energy neutrino candidate event IceCube-200227A
(GCN 27235), at the event time Fermi-GBM was observing the reported
neutrino location at:
RA, Dec: 348.26, +21.32 (J2000)
Error Radius: 30.80 arcmin, 90% PSF containment
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-200227A.
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 norm hard
--------------------------------------
0.128 s: 0.5 0.9 1.8
1.024 s: 0.2 0.3 0.7
8.192 s: 0.1 0.1 0.3