TITLE: GCN CIRCULAR NUMBER: 33553 SUBJECT: GRB 230402A: Fermi GBM Final Real-time Localization DATE: 23/04/02 07:42:54 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 07:32:35 UT on 2 Apr 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230402A (trigger 702113560.95607 / 230402314).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 93.1, Dec = -14.6 (J2000 degrees, equivalent to J2000 06h 12m, -14d 35'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 18.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/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/bn230402314/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/q...