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GCN Circular 30671

Subject
GRB 210821A: Fermi GBM Final Real-time Localization
Date
2021-08-21T07:51:40Z (3 years ago)
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 07:40:28 UT on 21 Aug 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210821A (trigger 651224433.594692 / 210821320).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 49.3, Dec = -6.9 (J2000 degrees, equivalent to J2000 03h 17m, -6d 54'), with a statistical uncertainty of 2.0 degrees.

The angle from the Fermi LAT boresight is 87.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210821320/quicklook/glg_skymap_all_bn210821320.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/bn210821320/quicklook/glg_healpix_all_bn210821320.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210821320/quicklook/glg_lc_medres34_bn210821320.gif
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