GCN Circular 5293

C. Guidorzi (Univ Bicocca & INAF-OAB), A. Moretti (INAF-OAB),
J. A. Kennea (PSU) on behalf of the Swift-XRT team:

We have analyzed the first two orbits of data of GRB060707
(Moretti et al 2006, GCN 5285
Not found
 
 
).
The XRT data set consists of 43 s exposure in Windowed
Timing (WT) in the first orbit followed by 3.1 ks exposure
in Photon Counting (PC).

The refined position of the source is

   RA  (2000) =  23h 48m 18.89s  
   Dec (2000) = -17d 54' 20.4"

with an uncertainty of 3.9 arcsec (90% containment).

This position is 2.1 arcsec from the XRT position
first reported (Moretti et al 2006, GCN 5285
Not found
 
 
),
3.7 arcsec from the IR optical afterglow candidate
position (de Ugarte-Postigo et al., GCN 5290
Not found
 
 
) and
22.4 arcsec from the BAT ground-calculated position
(Stamatikos et al. 2006, GCN 5289
Not found
 
 
).

The 0.3-10 keV X-ray light curve shows the typical
steep-to-shallow decay, with an initial power-law index
of alpha ~ 1.6, followed by alpha ~ 0.7, break time around 600s
from the BAT trigger time.

The PC spectrum is well fitted by an absorbed power law with
photon index 2.0 +/- 0.1 and N_H consistent with the Galactic value
(1.8e20 cm^-2). The average 0.3-10 keV unabsorbed flux during the
second orbit is 5.5e-12 erg cm^-2 s^-1.

Assuming alpha ~ 0.7, the extrapolated unabsorbed flux at 24 hours 
is 9e-13 erg cm^-2 s^-1.

This Circular is an official product of the Swift XRT Team.