GCN Circular 8009
Subject
GRB 080723B - Swift-XRT refined analysis
Date
2008-07-24T07:01:14Z (16 years ago)
From
Kim Page at U.of Leicester <kpa@star.le.ac.uk>
K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:
The INTEGRAL/Super-AGILE-detected GRB 080723B has now been observed by the
Swift-XRT for three orbits (a total of ~2.3 ks of Photon Counting mode
data). The source reported in GCN Circ. 8008 can now be seen to be fading
(alpha = 1.27 +/- 0.23), so is confirmed as the X-ray afterglow.
A spectrum formed from the combined data (~1.3 - 30 ks after the triggers)
can be fitted by a power-law of Gamma = 1.87 +/- 0.14, absorbed by the
Galactic column in this direction, of 7.42x10^21 cm^-2. The average
observed (unabsorbed) flux over this time is 1.49 (2.57) x 10^-9 erg cm^-2
s^-1, which provides an observed counts to flux conversion of 5.9x10^-9
erg cm^-2 count^-1.
If the decay were to continue with alpha ~1.27, the count rate 24 hours
after the trigger woule be 0.04 count s^-1 (corresponding to an observed
flux of 2.4x10^-10 erg cm^-2 s^-1).
The circular is an official product of the Swift-XRT team.