TITLE:   GCN CIRCULAR
NUMBER:  29188
SUBJECT: GRB 201228B: Fermi GBM Final Real-time Localization
DATE:    20/12/28 15:32:09 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 15:21:45 UT on 28 Dec 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201228B (trigger 630861710.97237 / 201228640).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 8.1, Dec = 50.7 (J2000 degrees, equivalent to J2000 00h 32m, 50d 42'), with a statistical uncertainty of 8.6 degrees.

The angle from the Fermi LAT boresight is 20.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201228640/quicklook/glg_skymap_all_bn201228640.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201228640/quicklook/glg_healpix_all_bn201228640.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201228640/quicklook/glg_lc_medres34_bn201228640.gif