GCN Circular 26538
Subject
GRB 191221B: Swift/UVOT redshift
Date
2019-12-22T01:33:28Z (4 years ago)
From
Paul Kuin at MSSL <npkuin@gmail.com>
N. P. M. Kuin (UCL-MSSL) reports on behalf of the Swift/UVOT team:
The Swift/UVOT obtained a 49s grism spectrum of GRB 191221B
242 s after the BAT trigger (Laha et al., GCN Circ. 26534).
The spectrum shows a clear break at 2008 Angstrom, suggesting
a redshift of z=1.19. At that redshift, the line of He II 1640A is well
defined
and N II 2143A is present, as well as possibly N V at 1243 A.