TITLE:   GCN CIRCULAR
NUMBER:  30752
SUBJECT: GRB 210903A: Fermi GBM Final Real-time Localization
DATE:    21/09/03 02:00:41 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 01:50:17 UT on 3 Sep 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210903A (trigger 652326622.389106 / 210903077).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 178.6, Dec = 39.1 (J2000 degrees, equivalent to J2000 11h 54m, 39d 06'), with a statistical uncertainty of 5.4 degrees.

The angle from the Fermi LAT boresight is 102.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210903077/quicklook/glg_skymap_all_bn210903077.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/bn210903077/quicklook/glg_healpix_all_bn210903077.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210903077/quicklook/glg_lc_medres34_bn210903077.gif