GCN Circular 29025
Subject
IceCube-201209A: Upper limits from Fermi-GBM Observations
Event
Date
2020-12-10T21:51:40Z (6 years ago)
From
Cori Fletcher at USRA <cfletcher@usra.edu>
C. Fletcher (USRA) reports on behalf of the Fermi-GBM Team:
For the IceCube high-energy neutrino candidate event 201209A (GCN 29012),
at the event time Fermi-GBM was observing the reported neutrino location at:
RA: 6.86 (+ 1.02 - 1.22 deg 90% PSF containment) J2000
Dec: -9.25 (+ 0.99 - 1.14 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-201209A.
We set upper limits on impulsive gamma-ray emission. Using the
representative soft, normal, and hard GRB-like templates
(arXiv:1612.02395), we report 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: 9.3 16. 25.
1.024 s: 3.2 5.1 7.9
8.192 s: 1.3 2.0 2.4