[vsnet-grb-info 27248] GRB 210123A: Fermi GBM Final Localization

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29351
SUBJECT: GRB 210123A: Fermi GBM Final Localization
DATE:    21/01/25 21:39:52 GMT
FROM:    Rachel Dunwoody at UCD  <rachel.dunwoody at ucdconnect.ie>

The Fermi GBM team reports the detection of a likely long GRB.

"At 07:19:03.07 UT on 23 January 2021, the Fermi Gamma-Ray Burst Monitor
(GBM)
triggered and located GRB 210123A (trigger 633079148 / 210123305).

This burst was also independently detected by INTEGRAL SPI-ACS and
the Insight-HXMT/HE (Xue et al. 2019, GCN 29349)

The on-ground calculated location, using the GBM trigger
data, is RA = 345.1, DEC = -56.9 (J2000 degrees,
equivalent to 23h 00m, -56d 53'), with a statistical uncertainty
of 1.1 degrees.

The angle from the Fermi LAT boresight is 110 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210123305/quicklook/glg_skymap_all_bn210123305.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/bn210123305/quicklook/glg_healpix_all_bn210123305.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210123305/quicklook/glg_lc_medres34_bn210123305.gif