GCN Circular 34856
Subject
GRB 231020A: Fermi GBM Final Real-time Localization
Date
2023-10-20T19:04:32Z (6 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 18:56:58 UT on 20 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231020A (trigger 719521023.300322 / 231020790).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 317.5, Dec = -28.7 (J2000 degrees, equivalent to J2000 21h 10m, -28d 41'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 87.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020790/quicklook/glg_skymap_all_bn231020790.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/bn231020790/quicklook/glg_healpix_all_bn231020790.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231020790/quicklook/glg_lc_medres34_bn231020790.gif
