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.

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