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TITLE:   GCN CIRCULAR
NUMBER:  25818
SUBJECT: GRB 190923A: Fermi GBM Final Real-time Localization
DATE:    19/09/23 14:58:21 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 14:48:02 UT on 23 Sep 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190923A (trigger 590942887.75117 / 190923617).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 8.2, Dec = -11.0 (J2000 degrees, equivalent to J2000 00h 32m, -11d 00'), with a statistical uncertainty of 4.9 degrees.

The angle from the Fermi LAT boresight is 43.0 degrees.

The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190923617/quicklook/glg_skymap_all_bn190923617.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/bn190923617/quicklook/glg_healpix_all_bn190923617.fit

The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190923617/quicklook/glg_lc_medres34_bn190923617.gif

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TITLE:   GCN CIRCULAR
NUMBER:  25820
SUBJECT: GRB 190923A: BALROG localization (Fermi Trigger 590942887 / GRB 190923617)
DATE:    19/09/23 15:09:00 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
590942887 at 14:48:02 on 23 Sept. 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) = 5.9+/-1.6 deg
Decl.(2000.0) = -14.0+/-1.3 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB190923617/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB190923617/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB190923617/json