TITLE: GCN CIRCULAR NUMBER: 34793 SUBJECT: GRB 231003A: Fermi GBM Final Real-time Localization DATE: 23/10/03 21:12:36 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 21:01:59 UT on 3 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231003A (trigger 718059724.905152 / 231003876).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 300.8, Dec = 71.1 (J2000 degrees, equivalent to J2000 20h 03m, 71d 05'), with a statistical uncertainty of 1.4 degrees.

The angle from the Fermi LAT boresight is 169.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231003876/q...

The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231003876/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231003876/q...

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