TITLE:   GCN CIRCULAR
NUMBER:  29101
SUBJECT: GRB 201221B: Fermi GBM Final Real-time Localization
DATE:    20/12/21 14:23:08 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 14:11:43 UT on 21 Dec 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201221B (trigger 630252708.014426 / 201221591).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 110.6, Dec = 32.0 (J2000 degrees, equivalent to J2000 07h 22m, 32d 00'), with a statistical uncertainty of 4.1 degrees.

The angle from the Fermi LAT boresight is 14.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201221591/quicklook/glg_skymap_all_bn201221591.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/bn201221591/quicklook/glg_healpix_all_bn201221591.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201221591/quicklook/glg_lc_medres34_bn201221591.gif