TITLE:   GCN CIRCULAR
NUMBER:  30786
SUBJECT: GRB 210909A: Fermi GBM Final Real-time Localization
DATE:    21/09/09 10:53:27 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 10:43:19 UT on 9 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210909A (trigger 652877004.365114 / 210909447).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 140.6, Dec = 83.3 (J2000 degrees, equivalent to J2000 09h 22m, 83d 17'), with a statistical uncertainty of 2.7 degrees.

The angle from the Fermi LAT boresight is 88.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210909447/quicklook/glg_skymap_all_bn210909447.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/bn210909447/quicklook/glg_healpix_all_bn210909447.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210909447/quicklook/glg_lc_medres34_bn210909447.gif