TITLE: GCN CIRCULAR NUMBER: 38698 SUBJECT: GRB 241229B: Fermi GBM Final Real-time Localization DATE: 24/12/29 01:46:54 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 01:36:16 UT on 29 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241229B (trigger 757128981.063788 / 241229067).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 275.0, Dec = 62.4 (J2000 degrees, equivalent to J2000 18h 19m, 62d 23'), with a statistical uncertainty of 6.1 degrees.

The angle from the Fermi LAT boresight is 27.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241229067/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/bn241229067/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241229067/q...

View this GCN Circular online at https://gcn.nasa.gov/circulars/38698. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...