TITLE:   GCN CIRCULAR
NUMBER:  34915
SUBJECT: GRB 231030B: Fermi GBM Final Real-time Localization
DATE:    23/10/30 20:08:47 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 19:58:19 UT on 30 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231030B (trigger 720388704.937126 / 231030832).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 244.0, Dec = 56.5 (J2000 degrees, equivalent to J2000 16h 15m, 56d 30'), with a statistical uncertainty of 1.1 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/2023/bn231030832/quicklook/glg_skymap_all_bn231030832.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/bn231030832/quicklook/glg_healpix_all_bn231030832.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231030832/quicklook/glg_lc_medres34_bn231030832.gif