Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 3703

GRB 050713A: Swift XRT extended light curve
2005-07-30T20:35:49Z (19 years ago)
David Burrows at PSU/Swift <>
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
Looking for U.S. government information and services? Visit