GCN Circular 31163
Subject
Fermi GBM Upper limits for GRB 211203A
Event
Date
2021-12-03T17:30:32Z (4 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
C. Malacaria (USRA) reports on behalf of the Fermi-GBM Team:
Swift/BAT detected GRB 211203A at 09:02:38 UT (GCN 31160).
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 the Swift/BAT time.
From this search, no significant signal was found related
to GRB 211203A.
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^-7 erg/s/cm^2):
Timescale Soft Normal Hard
-------------------------------------------
0.128 s: 4.7 9.2 17.0
1.024 s: 1.6 3.8 8.2
8.192 s: 0.4 0.9 2.0
These results are preliminary.
[1] Goldstein et al. 2019 arXiv:1903.12597