TITLE:   GCN CIRCULAR
NUMBER:  30896
SUBJECT: GRB 210929B: Fermi GBM Final Real-time Localization
DATE:    21/09/29 19:53:46 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 19:42:22 UT on 29 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210929B (trigger 654637347.41104 / 210929821).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 263.0, Dec = 2.4 (J2000 degrees, equivalent to J2000 17h 32m, 2d 23'), with a statistical uncertainty of 13.3 degrees.

The angle from the Fermi LAT boresight is 70.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929821/quicklook/glg_skymap_all_bn210929821.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/bn210929821/quicklook/glg_healpix_all_bn210929821.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210929821/quicklook/glg_lc_medres34_bn210929821.gif