[vsnet-grb-info 24577] Fermi-LAT ANTARES coincidence: Upper limits from Fermi-GBM Observations
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Jan 9 07:57:22 JST 2020
TITLE: GCN CIRCULAR
NUMBER: 26676
SUBJECT: Fermi-LAT ANTARES coincidence: Upper limits from Fermi-GBM Observations
DATE: 20/01/08 22:56:03 GMT
FROM: Joshua Wood at MSFC/Fermi-GBM <joshua.r.wood at nasa.gov>
J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM Team:
For the Fermi-LAT ANTARES coincidence event on 2020 January 8th (GCN 26674), at the event time Fermi-GBM was observing the reported location at:
RA: 02:53:55.6 (J2000)
Dec: -18:04:02 (J2000)
r_90: 0.832 deg (90%-containment)
There was no Fermi-GBM onboard trigger around the event time of the concidence event. 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 before the identified neutrino event at 09:25:12 UT until 30 seconds after the detection of the Fermi LAT photon at 09:35:16.96 UT. From this search, no significant signal was found related to the reported location.
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^-6 erg/s/cm^2):
Timescale Soft Normal Hard
--------------------------------------
0.128 s: 6.7 12. 21.
1.024 s: 1.7 2.5 5.0
8.192 s: 0.7 1.1 1.7
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