TITLE:   GCN CIRCULAR
NUMBER:  30843
SUBJECT: GRB 210917A: Fermi GBM Final Real-time Localization
DATE:    21/09/17 03:56:05 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 03:45:47 UT on 17 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210917A (trigger 653543152.223672 / 210917157).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 75.5, Dec = -36.2 (J2000 degrees, equivalent to J2000 05h 01m, -36d 12'), with a statistical uncertainty of 5.6 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/bn210917157/quicklook/glg_skymap_all_bn210917157.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/bn210917157/quicklook/glg_healpix_all_bn210917157.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210917157/quicklook/glg_lc_medres34_bn210917157.gif