TITLE:   GCN CIRCULAR
NUMBER:  29916
SUBJECT: GRB 210430B: Fermi GBM Final Real-time Localization
DATE:    21/04/30 21:52:37 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 21:42:17 UT on 30 Apr 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210430B (trigger 641511742.665196 / 210430904).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 348.2, Dec = 8.3 (J2000 degrees, equivalent to J2000 23h 12m, 8d 18'), with a statistical uncertainty of 6.5 degrees.

The angle from the Fermi LAT boresight is 76.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210430904/quicklook/glg_skymap_all_bn210430904.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/bn210430904/quicklook/glg_healpix_all_bn210430904.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210430904/quicklook/glg_lc_medres34_bn210430904.gif