TITLE:   GCN CIRCULAR
NUMBER:  34653
SUBJECT: GRB 230911B: Fermi GBM Final Real-time Localization
DATE:    23/09/11 04:37:15 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

The Fermi GBM team reports the detection of a likely LONG GRB

At 04:25:49 UT on 11 Sep 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230911B (trigger 716099154.520658 / 230911185).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 351.7, Dec = -55.0 (J2000 degrees, equivalent to J2000 23h 26m, -55d 00'), with a statistical uncertainty of 1.1 degrees.

The angle from the Fermi LAT boresight is 131.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230911185/quicklook/glg_skymap_all_bn230911185.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/bn230911185/quicklook/glg_healpix_all_bn230911185.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230911185/quicklook/glg_lc_medres34_bn230911185.gif