GCN Circular 7981

G. Stratta, M. Perri, B. Preger (ASDC) report on behalf of the
Swift-XRT team:

We analysed the first 3 orbits of XRT data for GRB 080714 (Perri et al.,
GCN Circ. 7978
Not found
 
 
) taken from 88s after the trigger (T0) in Windowed Timing
(WT)
mode and then in Photon Counting (PC) mode from T0+233 s to T0+9874 s.
The UVOT-enhanced XRT position was given by Goad et al. (GCN Circ. 7980
Not found
 
 
).

The X-ray light curve from T0+88s up to ~T0+300s shows an initial 40 seconds
long flat segment followed by an increasingly steepening decay. Starting
from
T0+300s (PC data) the light curve can be fit with a power law model with a
best fit slope of 1.0+/-0.1.

The WT data spectrum from T0+88s to T0+231s is well fitted by an absorbed
power law model with photon index Gamma=1.14+/-0.05 and a total equivalent
hydrogen column density of NH=(0.3+/-0.1)e22 cm**-2. The Galactic NH is
5.44e21 cm**-2 (Kalberla et al. 2005). The 0.3-10 keV observed (unabsorbed)
flux is (3.4+/-0.2)e-10 erg/cm**2/s ((3.9+/-0.2)e-10 erg/cm**2/s).

If the light-curve continues to decay with the same rate, the count rate
24 hours after the trigger is estimated to be ~6e-3 counts/s, which
corresponds to an observed flux of ~5e-13 erg/cm**2/s.

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