TITLE: GCN CIRCULAR NUMBER: 39262 SUBJECT: GRB 250210A: Fermi GBM Final Real-time Localization DATE: 25/02/10 05:42:14 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 05:31:40 UT on 10 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250210A (trigger 760858305.125996 / 250210230).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 150.3, Dec = -25.5 (J2000 degrees, equivalent to J2000 10h 01m, -25d 30'), with a statistical uncertainty of 2.8 degrees.

The angle from the Fermi LAT boresight is 30.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250210230/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/bn250210230/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250210230/q...

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