TITLE:   GCN CIRCULAR
NUMBER:  27708
SUBJECT: GRB 200509C: Fermi GBM Final Real-time Localization
DATE:    20/05/09 23:09:10 GMT
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 22:59:04 UT on 9 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200509C (trigger 610757949.499186 / 200509958).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 311.0, Dec = -3.7 (J2000 degrees, equivalent to J2000 20h 44m, -3d 42'), with a statistical uncertainty of 9.3 degrees.

The angle from the Fermi LAT boresight is 108.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200509958/quicklook/glg_skymap_all_bn200509958.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200509958/quicklook/glg_healpix_all_bn200509958.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200509958/quicklook/glg_lc_medres34_bn200509958.gif