GCN Circular 27758
Subject
Fermi GBM Sub-Threshold Detection of GRB 200517A
Event
Date
2020-05-19T16:46:54Z (6 years ago)
From
Cori Fletcher at USRA <cfletcher@usra.edu>
C. Fletcher (USRA) reports on behalf of the Fermi-GBM Team:
MAXI/GSC detected GRB 200517A at 11:27:21 UT (GCN 27750). There was no
Fermi-GBM onboard trigger around the event.
An automated, blind search for short gamma-ray bursts below the onboard
triggering threshold in Fermi-GBM identified no counterparts.
The GBM targeted search [1], the most sensitive, coherent search for
GRB-like signals identified a transient most significantly on the 8.192 s
timescale, with a log likelihood ratio of 13 and a location consistent with
the MAXI/GSC event. The GBM targeted search event was found with the highest
significance with a "soft" spectrum (Band function with Epeak=70 keV, alpha=-1.9,
beta=-3.7) for a GRB.
[1] Goldstein et al. 2019 arXiv:1903.12597