TITLE:   GCN CIRCULAR
NUMBER:  34974
SUBJECT: GRB 231109A: Fermi GBM Final Localization
DATE:    23/11/09 19:57:25 GMT
FROM:    Christian Malacaria at ISSI <cmalacaria.astro@gmail.com>

The Fermi GBM team reports the detection of a likely SHORT GRB.

At 06:34:01.34 UT on 9 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 231109A (trigger 721204446 / 231109274).

The on-ground calculated location, using the Fermi GBM trigger data, is RA
= 173.0, Dec = 50.7 (J2000 degrees, equivalent to J2000 11h 32m, 50d 42’),
with a statistical uncertainty of 6.8 degrees.

The angle from the Fermi LAT boresight is 143 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231109274/quicklook/glg_skymap_all_bn231109274.png

The HEALPix FITS file, including the estimated localization systematic, can
be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231109274/quicklook/glg_healpix_all_bn231109274.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231109274/quicklook/glg_lc_medres34_bn231109274.gif