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GCN Circular 34726

Subject
GRB 230918A: Fermi GBM Final Real-time Localization
Date
2023-09-18T10:03:09Z (7 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 09:52:36 UT on 18 Sep 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230918A (trigger 716723561.504536 / 230918412).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 222.5, Dec = -11.6 (J2000 degrees, equivalent to J2000 14h 50m, -11d 35'), with a statistical uncertainty of 17.1 degrees.

The angle from the Fermi LAT boresight is 63.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230918412/quicklook/glg_skymap_all_bn230918412.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/bn230918412/quicklook/glg_healpix_all_bn230918412.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230918412/quicklook/glg_lc_medres34_bn230918412.gif


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