TITLE:   GCN CIRCULAR
NUMBER:  28712
SUBJECT: GRB 201021A: Fermi GBM Final Real-time Localization
DATE:    20/10/21 02:50:20 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 02:39:55 UT on 21 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201021A (trigger 624940800.414594 / 201021111).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 174.4, Dec = -2.0 (J2000 degrees, equivalent to J2000 11h 37m, -2d 00'), with a statistical uncertainty of 2.5 degrees.

The angle from the Fermi LAT boresight is 91.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201021111/quicklook/glg_skymap_all_bn201021111.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/bn201021111/quicklook/glg_healpix_all_bn201021111.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201021111/quicklook/glg_lc_medres34_bn201021111.gif