[vsnet-grb-info 1739] GRB050712: XRT refined analysis

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  3579
SUBJECT: GRB050712: XRT refined analysis
DATE:    05/07/13 03:39:58 GMT
FROM:    Dirk Grupe at PSU/Swift-XRT  <grupe at astro.psu.edu>

D. Grupe, D. Burrows, D. Morris, A. Falcone, J. Nousek,
P. Meszaros, M. Chester (PSU), N. Gehrels (GSFC),
on behalf of the Swift-XRT team:

Title: GRB050712: XRT refined analysis


We analysed the XRT data of the first four
orbits of GRB050712 (GCN 3573, Grupe et al., 2005).  

The refined position using xrtcentroid is:

RA  (2000):  05 10 47.31
Dec (2000): +64 54 49.76

The centroiding error is 6 arcsec. This is 62 arcseconds from the refined
BAT position (GCN 3576, Markwardt et al., 2005) and
5.5 arcseconds from the tentative UVOT counterpart (GCN 3575, Rol et 
al., 2005)

The WT mode data can be fitted by a single power law with an X-ray slope
beta=1.20+/-0.08. The neutral absorption parameter is 1.8e21 1/cm2, which is
slightly higher than the Galactic value (1.3e21 1/cm2; Dickey & Lockman 
1990).
The PC mode data agree with this result within the errors.

The light curve shows a fading afterglow with a preliminary
decay slope of alpha=0.85+/-0.08.
The unabsorber 0.3-10.0 keV flux at 1 hour after the burst is estimated to
6.3e-12 ergs/s/cm2