TITLE:   GCN CIRCULAR
NUMBER:  29963
SUBJECT: GRB 210507A: Fermi GBM Final Real-time Localization
DATE:    21/05/07 18:51:02 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 18:40:38 UT on 7 May 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210507A (trigger 642105643.041502 / 210507778).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 285.9, Dec = -7.5 (J2000 degrees, equivalent to J2000 19h 03m, -7d 30'), with a statistical uncertainty of 4.8 degrees.

The angle from the Fermi LAT boresight is 60.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210507778/quicklook/glg_skymap_all_bn210507778.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210507778/quicklook/glg_healpix_all_bn210507778.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210507778/quicklook/glg_lc_medres34_bn210507778.gif