GCN Circular 3528
Subject
GRB 050607 - XRT refined data analysis
Event
Date
2005-06-07T16:56:15Z (20 years ago)
From
Claudio Pagani at PSU/Swift-XRT <pagani@astro.psu.edu>
C.Pagani, D. Grupe, D. Burrows, J. Kennea, J. Racusin (PSU), and N Gehrels
(GSFC), on behalf of the Swift XRT team report:
We analyzed the XRT data of the first two orbits of GRB 050607
(Retter et al., GCN #3525). The observations started at 09:13:02 UT
(100 s after the BAT burst trigger). Preliminary analysis of the data
obtained in the first 4.2ks of observations gives the following refined
coordinates for the X-ray afterglow:
Ra-2000: 20h 00m 42.6s
Dec-2000: 09d 08' 26.9"
The centroiding error is 6" radius (90%containment).
This position is about 5" from the optical afterglow position reported by
Rhoads (GCN #3527) and 3" from the previously reported XRT position (Retter
et al., GCN #3525).
The X-ray spectrum can be fitted with a single powerlaw with an X-ray
photon index=1.86+/-0.44. The fit is consistent with Galactic absorption
(NH=1.41e21 cm-2).
The lightcurve has a peak around 310sec after the burst trigger.
The source had a unabsorbed flux of 1.6e-12 ergs/s/cm2 at approximately one
hour after the burst and is decaying with a decay slope alpha=0.58+/-0.12.
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