TITLE:   GCN CIRCULAR
NUMBER:  39347
SUBJECT: GRB 250216A: Fermi GBM Final Real-time Localization
DATE:    25/02/16 20:31:20 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 20:20:43 UT on 16 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250216A (trigger 761430048.867762 / 250216848).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 212.4, Dec = 60.2 (J2000 degrees, equivalent to J2000 14h 09m, 60d 12'), with a statistical uncertainty of 12.7 degrees.

The angle from the Fermi LAT boresight is 50.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250216848/quicklook/glg_skymap_all_bn250216848.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250216848/quicklook/glg_healpix_all_bn250216848.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250216848/quicklook/glg_lc_medres34_bn250216848.gif