TITLE:   GCN CIRCULAR
NUMBER:  33682
SUBJECT: GRB 230425A: Fermi GBM Final Real-time Localization
DATE:    23/04/25 14:30:19 GMT
FROM:    Joe Mangan at IJCLab <joseph.mangan@ijclab.in2p3.fr>

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

At 05:30:39 UT on 25 Apr 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230425A (trigger 704093444 / 230425230).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 150.7 Dec = -33.9 (J2000 degrees, equivalent to J2000 10h 02m, 33d 54'), with a statistical uncertainty of 11.5 degrees.

The angle from the Fermi LAT boresight is 74 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230425230/quicklook/glg_skymap_all_bn230425230.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/bn230425230/quicklook/glg_healpix_all_bn230425230.fit

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230425230/quicklook/glg_lc_medres34_bn230425230.gif