GCN Circular 28053
Subject
Fermi-GBM Sub-Threshold Detection of GRB 200701A
Date
2020-07-01T22:59:04Z (5 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
C. Malacaria (NASA-MSFC/USRA) reports on behalf of the Fermi-GBM Team:
Swift-BAT detected GRB 200701A at 12:46:59 UT (Bernardini et al. 2020, GCN 28052).
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 also 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 39.
The location is consistent with that from Swift-BAT.
The spectrum is consistent with a "normal" GRB template
(Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3).
[1] Goldstein et al. 2019 arXiv:1903.12597