GCN Circular 27731
Subject
Fermi GBM Sub-Threshold Detection of GRB 200512A
Date
2020-05-13T20:19:43Z (4 years ago)
From
Peter Veres at UAH <veresp@gmail.com>
P. Veres (UAH) reports on behalf of the Fermi-GBM Team:
Swift-BAT detected GRB 200512A at 20:33:15 UT (GCN 27726). 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, was run from +/-30 s around BAT trigger time. A transient
source was identified whose most significant timescale according to the
search is 8.192 s, with a log likelihood ratio of 23. It has consistent
location, and it is consistent with a "normal" spectrum (Band function with
Epeak = 230 keV, alpha = -1.0, beta = -2.3) for a GRB.
[1] Goldstein et al. 2019 arXiv:1903.12597