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GCN Circular 31169

Subject
GRB 211204B: Fermi GBM Final Real-time Localization
Date
2021-12-04T12:00:38Z (2 years 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 11:50:05 UT on 4 Dec 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 211204B (trigger 660311410.858238 / 211204493).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 267.9, Dec = 13.5 (J2000 degrees, equivalent to J2000 17h 51m, 13d 30'), with a statistical uncertainty of 2.9 degrees.

The angle from the Fermi LAT boresight is 90.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211204493/quicklook/glg_skymap_all_bn211204493.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211204493/quicklook/glg_healpix_all_bn211204493.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211204493/quicklook/glg_lc_medres34_bn211204493.gif
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