GCN Circular 29870
Subject
GRB 210421B: Fermi GBM Final Localization
Date
2021-04-21T20:03:10Z (4 years ago)
From
Joe Mangan at UCD <joseph.mangan@ucdconnect.ie>
The Fermi GBM team reports the detection of a likely short GRB
At 10:54:44.812 UT on 21 Apr 2021, the Fermi Gamma-ray Burst Monitor
(GBM) triggered and located GRB 210421B (trigger 640695289 /
210421455).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 272.1, Dec = 57.2(J2000 degrees, equivalent to J2000 18h 08m,
57d 09'), with a statistical uncertainty of 2.1 degrees.
The angle from the Fermi LAT boresight is 20.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210421455/quicklook/glg_skymap_all_bn210421455.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/bn210421455/quicklook/glg_healpix_all_bn210421455.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210421455/quicklook/glg_lc_medres34_bn210421455.gif