[vsnet-grb-info 24246] IceCube-191204A: Upper limits from Fermi-GBM Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26345
SUBJECT: IceCube-191204A: Upper limits from Fermi-GBM Observations 
DATE:    19/12/05 16:51:29 GMT
FROM:    C. Michelle Hui at MSFC/Fermi-GBM  <c.m.hui at nasa.gov>

C. M. Hui (MSFC) and P. Veres (UAH) report on behalf of the Fermi-GBM team:



For the IceCube high-energy neutrino candidate event 191204A (GCN 26341), at the event time Fermi-GBM was observing the reported neutrino location at:



RA: 79.72 (+3.20 -1.74 deg 90% PSF containment) J2000

Dec: 2.80 (+1.12 -1.23 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-191204A.



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:     15      20      37

1.024 s:      3.4     4.4    12

8.192 s:      1.3     2.3     3.6