TITLE: GCN CIRCULAR NUMBER: 40136 SUBJECT: GRB 250411A: Fermi GBM Final Real-time Localization DATE: 25/04/11 18:27:41 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 18:17:09 UT on 11 Apr 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250411A (trigger 766088234.189348 / 250411762).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.7, Dec = -13.9 (J2000 degrees, equivalent to J2000 16h 22m, -13d 54'), with a statistical uncertainty of 3.4 degrees.
The angle from the Fermi LAT boresight is 98.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250411762/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/bn250411762/q...
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250411762/q...
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