TITLE:   GCN CIRCULAR
NUMBER:  33570
SUBJECT: GRB 230405B: Fermi GBM Final Real-time Localization
DATE:    23/04/05 20:08:29 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 19:58:03 UT on 5 Apr 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230405B (trigger 702417488.872428 / 230405832).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 276.9, Dec = -50.3 (J2000 degrees, equivalent to J2000 18h 27m, -50d 17'), with a statistical uncertainty of 1.6 degrees.

The angle from the Fermi LAT boresight is 110.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230405832/quicklook/glg_skymap_all_bn230405832.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/bn230405832/quicklook/glg_healpix_all_bn230405832.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230405832/quicklook/glg_lc_medres34_bn230405832.gif