IceCube-201120A: Upper limits from Fermi-GBM Observations
Abstract
For the IceCube high-energy neutrino candidate event IceCube-201120A (GCN 28927), at the event time Fermi-GBM was observing the reported neutrino location at: RA: 307.53 (+5.34 -5.59 deg 90% PSF containment) J2000 Dec: 40.77 (+4.97 -2.80 deg 90% PSF containment) J2000 A Fermi-GBM onboard GRB trigger (627557935 / 201120402) occurred around 6 minutes prior to the event time of the neutrino candidate. However, we estimate that the spatial localization of this trigger only has a 20% chance of association with the neutrino event. It is likely unrelated. 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-201120A. 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: 10. 16. 29. 1.024 s: 2.1 3.7 7.3 8.192 s: 0.7 0.9 2.0 These results are preliminary.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- November 2020
- Bibcode:
- 2020GCN.28931....1W