TITLE:   GCN CIRCULAR
NUMBER:  33684
SUBJECT: GRB 230426A: Fermi GBM Final Real-time Localization
DATE:    23/04/26 20:39:19 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 20:28:59 UT on 26 Apr 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230426A (trigger 704233744.96626 / 230426853).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 38.5, Dec = -82.4 (J2000 degrees, equivalent to J2000 02h 34m, -82d 24'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 49.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230426853/quicklook/glg_skymap_all_bn230426853.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/bn230426853/quicklook/glg_healpix_all_bn230426853.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230426853/quicklook/glg_lc_medres34_bn230426853.gif