TITLE:   GCN CIRCULAR
NUMBER:  34893
SUBJECT: GRB 231028A: Fermi GBM Final Real-time Localization
DATE:    23/10/28 04:19:34 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 04:09:06 UT on 28 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231028A (trigger 720158951.657448 / 231028173).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 214.3, Dec = 21.8 (J2000 degrees, equivalent to J2000 14h 17m, 21d 48'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 23.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231028173/quicklook/glg_skymap_all_bn231028173.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/bn231028173/quicklook/glg_healpix_all_bn231028173.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231028173/quicklook/glg_lc_medres34_bn231028173.gif