TITLE:   GCN CIRCULAR
NUMBER:  33405
SUBJECT: GRB 230307A: Fermi GBM Final Real-time Localization
DATE:    23/03/07 15:54:24 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 15:44:06 UT on 7 Mar 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230307A (trigger 699896651.671248 / 230307656).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 54.1, Dec = -76.6 (J2000 degrees, equivalent to J2000 03h 36m, -76d 35'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 142.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230307656/quicklook/glg_skymap_all_bn230307656.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/bn230307656/quicklook/glg_healpix_all_bn230307656.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230307656/quicklook/glg_lc_medres34_bn230307656.gif