TITLE:   GCN CIRCULAR
NUMBER:  38495
SUBJECT: GRB 241209E: Fermi GBM Final Real-time Localization
DATE:    24/12/09 18:37:23 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 18:26:43 UT on 9 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241209E (trigger 755461608.700102 / 241209769).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 53.1, Dec = 7.6 (J2000 degrees, equivalent to J2000 03h 32m, 7d 35'), with a statistical uncertainty of 9.8 degrees.

The angle from the Fermi LAT boresight is 57.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241209769/quicklook/glg_skymap_all_bn241209769.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/bn241209769/quicklook/glg_healpix_all_bn241209769.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241209769/quicklook/glg_lc_medres34_bn241209769.gif