TITLE:   GCN CIRCULAR
NUMBER:  29789
SUBJECT: GRB 210411A: Fermi GBM Final Real-time Localization
DATE:    21/04/11 03:41:20 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 03:30:56 UT on 11 Apr 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210411A (trigger 639804661.435174 / 210411146).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 259.4, Dec = -27.4 (J2000 degrees, equivalent to J2000 17h 17m, -27d 23'), with a statistical uncertainty of 3.0 degrees.

The angle from the Fermi LAT boresight is 90.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210411146/quicklook/glg_skymap_all_bn210411146.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/bn210411146/quicklook/glg_healpix_all_bn210411146.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210411146/quicklook/glg_lc_medres34_bn210411146.gif