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/q...

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/q...

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

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