GRB 230520B
GCN Circular 33836
Subject
GRB 230520B: Fermi GBM Final Real-time Localization
Date
2023-05-20T23:22:06Z (2 years 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 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:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230520966/quicklook/glg_skymap_all_bn230520966.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/bn230520966/quicklook/glg_healpix_all_bn230520966.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230520966/quicklook/glg_lc_medres34_bn230520966.gif
GCN Circular 33837
Subject
GRB 230520B is not a GRB
Date
2023-05-21T00:41:11Z (2 years ago)
From
Suraj Poolakkil at UAH <sp0076@uah.edu>
S. Poolakkil (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor
Team:
"The Fermi Gamma-ray Burst Monitor (GBM) trigger 706317104/230520966 at 23:11:39.14 UT
on 20 May 2023, tentatively classified as GRB 230520B (GCN 33836), is
in fact not due to a GRB. This trigger is likely due to Local Particles."