TITLE:   GCN CIRCULAR
NUMBER:  33716
SUBJECT: GRB 230430B: Fermi GBM Final Localization
DATE:    23/05/02 07:06:30 GMT
FROM:    Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>

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

At 08:50:32 UT on 30 Apr 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230430B (trigger 704537437 / 230430368).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 113.9 Dec = -31.2 (J2000 degrees, equivalent to J2000 7h 36m, -31d 12'), with a statistical uncertainty of 3.02 degrees.

The angle from the Fermi LAT boresight is 27 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230430368/quicklook/glg_skymap_all_bn230430368.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/bn230430368/quicklook/glg_healpix_all_bn230430368.fit

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230430368/quicklook/glg_lc_medres34_bn230430368.gif