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GCN Circular 33991

Subject
GRB 230618B: Fermi GBM Final Real-time Localization
Date
2023-06-18T05:37:37Z (10 months ago)
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 05:26:11 UT on 18 Jun 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230618B (trigger 708758776.929754 / 230618227).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 257.5, Dec = -6.7 (J2000 degrees, equivalent to J2000 17h 10m, -6d 42'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 90.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230618227/quicklook/glg_skymap_all_bn230618227.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/bn230618227/quicklook/glg_healpix_all_bn230618227.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230618227/quicklook/glg_lc_medres34_bn230618227.gif


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