| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
11:49:36 UTC |
GCN_circulars,Fermi GBM final loc |
| ra |
90.0000° |
GCN_circulars,Fermi GBM final loc |
| decl |
-6.5000° |
GCN_circulars,Fermi GBM final loc |
| GBM_located |
True |
|
| mjd |
59480.49277777778 |
GCN_circulars,Fermi GBM final loc |
| GCN 30865 table |
|---|
| GRB_name |
GRB210923A |
| GCN_number |
30865 |
| Detection_method |
Fermi GBM final loc |
| t_trigger |
11:49:36 UTC |
| ra |
90.0000° |
| decl |
-6.5000° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 30865
SUBJECT: GRB 210923A: Fermi GBM Final Real-time Localization
DATE: 21/09/23 11:57:13 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM
The Fermi GBM team reports the detection of a likely SHORT GRB
At 11:49:36 UT on 23 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210923A (trigger 654090581.820056 / 210923493).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 90.0, Dec = -6.5 (J2000 degrees, equivalent to J2000 06h 00m, -6d 30'), with a statistical uncertainty of 10.9 degrees.
The angle from the Fermi LAT boresight is 47.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210923493/quicklook/glg_skymap_all_bn210923493.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210923493/quicklook/glg_healpix_all_bn210923493.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210923493/quicklook/glg_lc_medres34_bn210923493.gif
|
| GCN 30873 table |
|---|
| GRB_name |
GRB210923A |
| GCN_number |
30873 |
| Detection_method |
Fermi GBM Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 30873
SUBJECT: Retraction of Fermi GBM GRB 210923A: the trigger is not a GRB
DATE: 21/09/23 22:03:59 GMT
FROM: Joe Mangan at UCD
J.Mangan (UCD), S.Lesage (UAH) report on behalf of the Fermi Gamma-ray
Burst Monitor Team:
The Fermi Gamma-ray Burst Monitor (GBM) trigger 654090581/210923493 at
11:49:36.820 UT
on 23 September 2021, tentatively classified as a GRB (GCN 30865), is in
fact not due
to a GRB. This trigger is likely due to a terrestrial electron beam (TEB).
|