TITLE: GCN CIRCULAR NUMBER: 38716 SUBJECT: GRB 241229C: Fermi GBM Final Real-time Localization DATE: 24/12/29 23:38:14 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 SHORT GRB

At 23:27:37 UT on 29 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241229C (trigger 757207662.335616 / 241229978).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 219.8, Dec = 15.3 (J2000 degrees, equivalent to J2000 14h 39m, 15d 18'), with a statistical uncertainty of 16.2 degrees.

The angle from the Fermi LAT boresight is 12.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241229978/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/bn241229978/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241229978/q...

View this GCN Circular online at https://gcn.nasa.gov/circulars/38716. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...