D. Morris, D. N. Burrows, A. Falcone, P. Roming (PSU), K. Page, M. Goad
(Leicester), M. Trippico (GSFC-SSAI), F. Marshall and N. Gehrels (GSFC)
report on behalf of the Swift XRT team:
The Swift XRT has continued to monitor the light curve of GRB050713a with
data taken as late as 10 days after the burst trigger.
We confirm the XMM observation of a decaying lightcurve with powerlaw slope
consistent with alpha=1.45 during the epoch 20ks-50ks after the burst
trigger (De Luca et al, GCN3695). We note, however, that the entire XRT
dataset, from 4ks to 1000ks after the burst trigger, shows a powerlaw shape
very well fit by an alpha=1.15 decay index, with no evidence for a jet
break. We suggest that the steeper slope seen between 20ks-50ks may be due
to flaring activity.
The XRT count rate during the last observation, on July 23rd, was 6e-4
cts/s, equivalent to a flux of 4e-14 ergs/cm^2/s