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GCN Circular 35129

Subject
GRB 231120A: Fermi GBM Final Real-time Localization
Date
2023-11-20T00:32:39Z (8 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 LONG GRB

At 00:23:08 UT on 20 Nov 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231120A (trigger 722132593.748426 / 231120016).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 50.7, Dec = 1.4 (J2000 degrees, equivalent to J2000 03h 22m, 1d 23'), with a statistical uncertainty of 18.2 degrees.

The angle from the Fermi LAT boresight is 73.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231120016/quicklook/glg_skymap_all_bn231120016.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/bn231120016/quicklook/glg_healpix_all_bn231120016.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231120016/quicklook/glg_lc_medres34_bn231120016.gif


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