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GCN Circular 29927

Subject
GRB 210503A: Fermi GBM Final Real-time Localization
Date
2021-05-03T19:44:33Z (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 19:34:09 UT on 3 May 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210503A (trigger 641763254.461374 / 210503815).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 328.9, Dec = 66.0 (J2000 degrees, equivalent to J2000 21h 55m, 66d 00'), with a statistical uncertainty of 5.1 degrees.

The angle from the Fermi LAT boresight is 32.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210503815/quicklook/glg_skymap_all_bn210503815.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/bn210503815/quicklook/glg_healpix_all_bn210503815.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210503815/quicklook/glg_lc_medres34_bn210503815.gif
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