TITLE:   GCN CIRCULAR
NUMBER:  34275
SUBJECT: GRB 230727A: Fermi GBM Final Real-time Localization
DATE:    23/07/27 11:13:44 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 11:03:06 UT on 27 Jul 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230727A (trigger 712148591.84604 / 230727460).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 323.8, Dec = 73.7 (J2000 degrees, equivalent to J2000 21h 35m, 73d 42'), with a statistical uncertainty of 1.2 degrees.

The angle from the Fermi LAT boresight is 100.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230727460/quicklook/glg_skymap_all_bn230727460.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/bn230727460/quicklook/glg_healpix_all_bn230727460.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230727460/quicklook/glg_lc_medres34_bn230727460.gif