GCN Circular 41314
Subject
Corrected Swift-XRT Refined Analysis of GRB 250809A
Event
Date
2025-08-10T10:35:32Z (9 months ago)
From
K.L. Page at U Leicester <klp5@leicester.ac.uk>
Via
email
K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:
GCN Circ. 41313 provided an incomplete automatic modelling of the XRT
light-curve of GRB 250809A. The first snapshot of data is dominated by a
large flare, peaking at 240 s after the BAT trigger. The underlying decay
can be modelled as a power-law with alpha = 3.0 +/- 0.2.
If the light curve continues to decay with a power-law decay index of
3.0, the count rate at T+24 hours will be 2.3 x 10^-8 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.3 x
10^-20 (1.5 x 10^-19) erg cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.