GCN Circular 26020

R. Hamburg (UAH) reports on behalf of the Fermi GBM Team:

The Fermi Gamma-ray Burst Monitor (GBM) trigger (trigger 592997024 /
191017391)
at 09:23:39.27 UT on 17 October, 2019, was misclassified by the GBM flight
software as a particle event but is in fact due to a GRB.

Therefore, the Fermi GBM team reports the detection of GRB 191017A. The
on-ground calculated location, using the Fermi GBM trigger data, is
RA = 171.25, Dec = +38.05 (J2000 degrees, equivalent to J2000 11h 25m, 38d
03'),
with a statistical uncertainty of 1.5 degrees. The angle from the Fermi LAT
boresight is 131.44 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191017391/quicklook/glg_skymap_all_bn191017391.png

The HEALPix FITS file, including the estimated localization systematic, can
be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191017391/quicklook/glg_healpix_all_bn191017391.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191017391/quicklook/glg_lc_medres34_bn191017391.gif