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GCN Circular 34613

Subject
GRB 230904A: Fermi GBM Final Real-time Localization
Date
2023-09-04T08:30:14Z (9 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely SHORT GRB

At 08:19:31 UT on 4 Sep 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230904A (trigger 715508376.33399 / 230904347).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 278.5, Dec = -20.8 (J2000 degrees, equivalent to J2000 18h 33m, -20d 48'), with a statistical uncertainty of 21.7 degrees.

The angle from the Fermi LAT boresight is 74.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230904347/quicklook/glg_skymap_all_bn230904347.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230904347/quicklook/glg_healpix_all_bn230904347.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230904347/quicklook/glg_lc_medres34_bn230904347.gif


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