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GCN Circular 33031

Subject
GRB 221209A: Fermi GBM Final Real-time Localization
Date
2022-12-09T06:00:47Z (a year ago)
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 05:50:24 UT on 9 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221209A (trigger 692257829.852778 / 221209243).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 241.7, Dec = 48.1 (J2000 degrees, equivalent to J2000 16h 06m, 48d 06'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 97.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221209243/quicklook/glg_skymap_all_bn221209243.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221209243/quicklook/glg_healpix_all_bn221209243.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221209243/quicklook/glg_lc_medres34_bn221209243.gif
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