IceCube-210811A: Upper limits from Fermi-GBM Observations
Abstract
For the IceCube high-energy neutrino candidate event IceCube-210811A (GCN 30627), at the event time Fermi-GBM was observing the reported neutrino location at: RA: 270.79 (+1.07, -1.08 deg 90% PSF containment) J2000 Dec: 25.28 (+0.79, -0.84 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-210811A. 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: 8.7 11. 19. 1.024 s: 2.1 2.7 4.3 8.192 s: 1.1 1.4 1.5 These results are preliminary.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- August 2021
- Bibcode:
- 2021GCN.30649....1F