[vsnet-grb-info 27767] GRB 210421B: Fermi GBM Final Localization

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29870
SUBJECT: GRB 210421B: Fermi GBM Final Localization
DATE:    21/04/21 20:03:10 GMT
FROM:    Joe Mangan at UCD  <joseph.mangan at 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