GCN Circular 38643
Subject
GRB 241221A: Fermi GBM Final Real-time Localization
Date
2024-12-21T00:33:14Z (19 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 00:22:34 UT on 21 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241221A (trigger 756433359.308788 / 241221016).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 79.5, Dec = 29.2 (J2000 degrees, equivalent to J2000 05h 17m, 29d 11'), with a statistical uncertainty of 11.1 degrees.
The angle from the Fermi LAT boresight is 68.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241221016/quicklook/glg_skymap_all_bn241221016.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241221016/quicklook/glg_healpix_all_bn241221016.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241221016/quicklook/glg_lc_medres34_bn241221016.gif