TITLE:   GCN CIRCULAR
NUMBER:  35393
SUBJECT: GRB 231216A: Swift-XRT refined analysis correction
DATE:    23/12/17 19:53:03 GMT
FROM:    K.L. Page at U Leicester <klp5@leicester.ac.uk>

K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:

GCN Circular 35391 omitted the uncertainties on the light curve power-law
decay for the Swift-XRT data. The correct value is a decay index of
alpha=0.72 (+0.11, -0.09).

If the light curve continues to decay with a power-law decay index of
0.72, the count rate at T+24 hours will be 4.8 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x 10^-13
(2.8 x 10^-13) erg cm^-2 s^-1.

This circular is an official product of the Swift-XRT team.