TITLE:   GCN CIRCULAR
NUMBER:  27707
SUBJECT: GRB 200509B: Fermi GBM Final Real-time Localization
DATE:    20/05/09 19:48:58 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 SHORT GRB

At 19:38:38 UT on 9 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200509B (trigger 610745923.819 / 200509818).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 75.3, Dec = 71.0 (J2000 degrees, equivalent to J2000 05h 01m, 71d 00'), with a statistical uncertainty of 14.2 degrees.

The angle from the Fermi LAT boresight is 114.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200509818/quicklook/glg_skymap_all_bn200509818.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/bn200509818/quicklook/glg_healpix_all_bn200509818.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200509818/quicklook/glg_lc_medres34_bn200509818.gif