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GCN Circular 25308

HAWC-190806A: Upper limits from Fermi-GBM Observations
2019-08-09T20:14:57Z (5 years ago)
Joshua Wood at MSFC/Fermi-GBM <>
J. Wood (NASA/MSFC) and S. Poolakkil (UAH) report on behalf of the Fermi GBM Team:

For HAWC-190806A, Fermi-GBM was observing the full localization region at event time.

There was no Fermi-GBM onboard trigger around the event time of HAWC-190806A (GCN 25284). 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 trigger time, and also identified no counterpart candidates.

We therefore 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:   2.4      4.8      14.
1.024 s:   0.9      1.5      4.6
8.192 s:   0.4      0.7      1.7
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