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 3602

GRB050713b: XRT refined analysis
2005-07-13T21:37:29Z (19 years ago)
David Burrows at PSU/Swift <>
K. Page, S. Vaughan, M. Goad (Leicester), D. N. Burrows (PSU), M. Ajello 
(MPE), R. Fink and N. Gehrels (GSFC) report on behalf of the Swift XRT team:

We have analysed the first two orbits of data for GRB050713b (GCN 3590, 
Vaughan et al., 2005).  Using xrtcentoid, the refined position is:

RA(J2000) = 20h 31m 15.5s
Dec(J2000) = +60d 56' 40.4"

with an uncertainty of 6 arcsec. This is only 2 arcsec from the original 
XRT position (GCN 3590, Vaughan et al., 2005).

The light-curve shows a steeply fading afterglow during the first orbit, 
with a decay slope of
alpha = 2.88 +/- 0.12 between 143 and 600 seconds after the trigger.  After 
~5000 seconds (i.e. on the second orbit), the light-curve flattens 
significantly; more data are required to constrain the slope following the 
break in the light curve.

The WT spectrum can be fitted by an absorbed power-law with a spectral
index, Gamma = 1.70 +0.11/-0.09 and excess NH of (1.97 +0.50/-0.43)e21

The unabsorbed 0.3-10 keV flux (averaged over 143 and 330 seconds after
the burst) is (9.02 +0.16/0.80)e-10 erg cm^-2 s^-1.
Looking for U.S. government information and services? Visit