GRB 230209A
GCN Circular 33306
Subject
GRB 230209A: Fermi GBM Final Real-time Localization
Date
2023-02-09T04:38:55Z (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 04:28:40 UT on 9 Feb 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230209A (trigger 697609725.271226 / 230209187).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 227.8, Dec = -18.6 (J2000 degrees, equivalent to J2000 15h 11m, -18d 36'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 1.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209187/quicklook/glg_skymap_all_bn230209187.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/bn230209187/quicklook/glg_healpix_all_bn230209187.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209187/quicklook/glg_lc_medres34_bn230209187.gif
GCN Circular 33308
Subject
GRB 230209A is not a GRB
Date
2023-02-09T17:19:49Z (2 years ago)
From
Joshua Wood at MSFC/Fermi-GBM <joshua.r.wood@nasa.gov>
J. Wood (NASA/MSFC) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:
"The Fermi Gamma-ray Burst Monitor (GBM) trigger 697609725/230209187 at 04:28:40 UT
on 09 February 2023, tentatively classified as GRB 230209A (GCN 33306), is in fact not due
to a GRB. This trigger is likely due to local particles."