TITLE: GCN CIRCULAR NUMBER: 38682 SUBJECT: GRB 241228B: Fermi GBM Final Real-time Localization DATE: 24/12/28 04:23:41 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 04:13:05 UT on 28 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241228B (trigger 757051990.391412 / 241228176).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 122.2, Dec = 14.0 (J2000 degrees, equivalent to J2000 08h 08m, 14d 00'), with a statistical uncertainty of 1.7 degrees.

The angle from the Fermi LAT boresight is 49.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241228176/q...

The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241228176/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241228176/q...

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