TITLE:   GCN CIRCULAR
NUMBER:  29659
SUBJECT: GRB 210317A: Fermi GBM Final Real-time Localization
DATE:    21/03/17 09:18:31 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 09:08:29 UT on 17 Mar 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210317A (trigger 637664914.045098 / 210317381).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 154.2, Dec = -64.9 (J2000 degrees, equivalent to J2000 10h 16m, -64d 54'), with a statistical uncertainty of 1.5 degrees.

The angle from the Fermi LAT boresight is 159.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210317381/quicklook/glg_skymap_all_bn210317381.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/bn210317381/quicklook/glg_healpix_all_bn210317381.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210317381/quicklook/glg_lc_medres34_bn210317381.gif