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GCN Circular 33836

GRB 230520B: Fermi GBM Final Real-time Localization
2023-05-20T23:22:06Z (18 days ago)
Fermi GBM Team at MSFC/Fermi-GBM <>
The Fermi GBM team reports the detection of a likely LONG GRB At 23:11:39 UT on 20 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230520B (trigger 706317104.139708 / 230520966). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 31.7, Dec = -62.1 (J2000 degrees, equivalent to J2000 02h 06m, -62d 06'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 152.0 degrees. The skymap can be found here: The HEALPix FITS file, including the estimated localization systematic, can be found here: The GBM light curve can be found here:
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