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TITLE:   GCN CIRCULAR
NUMBER:  26016
SUBJECT: 191017A: BALROG localization (Fermi Trigger 592997024 / GRB 191017391)
DATE:    19/10/17 09:51:07 GMT
FROM:    Jochen Greiner at MPE,Garching  <jcg@mpe.mpg.de>

F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
592997024 at 09:23:39 on 17 Oct. 2019 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).

The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 169.0+/-2.3 deg
Decl.(2000.0) = 44.7+/-2.8 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB191017391/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB191017391/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB191017391/json

                        

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TITLE:   GCN CIRCULAR
NUMBER:  26020
SUBJECT: GRB 191017A: Fermi GBM Final Localization
DATE:    19/10/17 14:22:00 GMT
FROM:    Rachel Hamburg at UAH  <rkh0007@uah.edu>

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