GCN Circular 15344
Subject
GRB 131014A: Swift-XRT refined Analysis
Date
2013-10-16T11:06:55Z (11 years ago)
From
Kim Page at U.of Leicester <klp5@leicester.ac.uk>
A. Amaral-Rogers, P.A. Evans & K.L. Page (U.Leicester) report on behalf of
the Swift-XRT team:
We have analysed 11 ks of XRT data for the Fermi/LAT-detected burst:
GRB 131014A, from 44.1 ks to 173.4 ks after the Fermi/LAT trigger. The
data are entirely in Photon Counting (PC) mode. An X-ray source is
detected within the Fermi/LAT error circle.
The enhanced XRT position was given in GCN Circ. 15339 (Evans &
Amaral-Rogers).
The light curve can be modelled with a power-law decay with a decay
index of alpha=1.53 (+/-0.28).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.2 (+0.7, -0.6). The
best-fitting absorption column is 6.8 (+4.0, -3.0) x 10^21 cm^-2, in
excess of the Galactic value of 2.2 x 10^21 cm^-2 (Kalberla et al.
2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 3.9 x 10^-11 (8.5 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 6.8 (+4.0, -3.0) x 10^21 cm^-2
Galactic foreground: 2.2 x 10^21 cm^-2
Excess significance: 2.5 sigma
Photon index: 2.2 (+0.7, -0.6)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00020300.
This circular is an official product of the Swift-XRT team.