TITLE: GCN CIRCULAR NUMBER: 39357 SUBJECT: GRB 250217C: Fermi GBM Final Real-time Localization DATE: 25/02/18 00:05:15 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 SHORT GRB

At 23:54:41 UT on 17 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250217C (trigger 761529286.801804 / 250217996).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 131.6, Dec = 32.9 (J2000 degrees, equivalent to J2000 08h 46m, 32d 53'), with a statistical uncertainty of 5.5 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/2025/bn250217996/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/bn250217996/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250217996/q...

View this GCN Circular online at https://gcn.nasa.gov/circulars/39357. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...