TITLE:   GCN CIRCULAR
NUMBER:  36338
SUBJECT: GRB 240428A: Fermi GBM Final Real-time Localization
DATE:    24/04/28 15:13:15 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 15:02:54 UT on 28 Apr 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240428A (trigger 736009379.32712 / 240428627).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 178.1, Dec = 20.4 (J2000 degrees, equivalent to J2000 11h 52m, 20d 23'), with a statistical uncertainty of 3.3 degrees.

The angle from the Fermi LAT boresight is 27.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240428627/quicklook/glg_skymap_all_bn240428627.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240428627/quicklook/glg_healpix_all_bn240428627.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240428627/quicklook/glg_lc_medres34_bn240428627.gif