TITLE: GCN CIRCULAR NUMBER: 39035 SUBJECT: GRB 250126A: Fermi GBM Final Real-time Localization DATE: 25/01/26 05:09:08 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 04:58:50 UT on 26 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250126A (trigger 759560335.992228 / 250126208).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 337.4, Dec = -11.6 (J2000 degrees, equivalent to J2000 22h 29m, -11d 35'), with a statistical uncertainty of 2.2 degrees.

The angle from the Fermi LAT boresight is 69.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250126208/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/bn250126208/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250126208/q...

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