TITLE:   GCN CIRCULAR
NUMBER:  29896
SUBJECT: GRB 210424A: Fermi GBM Final Real-time Localization
DATE:    21/04/24 18:50:18 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 18:40:11 UT on 24 Apr 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210424A (trigger 640982416.446996 / 210424778).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 9.0, Dec = 13.7 (J2000 degrees, equivalent to J2000 00h 36m, 13d 41'), with a statistical uncertainty of 14.1 degrees.

The angle from the Fermi LAT boresight is 72.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210424778/quicklook/glg_skymap_all_bn210424778.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/bn210424778/quicklook/glg_healpix_all_bn210424778.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210424778/quicklook/glg_lc_medres34_bn210424778.gif