TITLE: GCN CIRCULAR NUMBER: 40150 SUBJECT: GRB 250416B: Fermi GBM Final Real-time Localization DATE: 25/04/16 15:57:09 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 15:46:42 UT on 16 Apr 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250416B (trigger 766511207.410564 / 250416657).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 103.8, Dec = -62.2 (J2000 degrees, equivalent to J2000 06h 55m, -62d 12'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 166.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250416657/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/bn250416657/q...
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250416657/q...
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