GCN Circular 18606
Subject
GRB 151114A: Swift-XRT refined Analysis
Date
2015-11-15T10:12:04Z (9 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
L.M. McCauley (PSU), K.L. Page (U. Leicester), C. Pagani (U.
Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (ASDC), A. D'ai
(INAF-IASFPA), A. Maselli (INAF-IASFPA), J.A. Kennea (PSU), B.
Sbarufatti (INAF-OAB/PSU) and M.H. Siegel report on behalf of the
Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 151114A (Siegel et al. GCN
Circ. 18599), from 97 s to 48.6 ks after the BAT trigger. The data are
entirely in Photon Counting (PC) mode. The enhanced XRT position for
this burst was given by Beardmore et al. (GCN Circ. 18600).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.73 (+0.05, -0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.00 (+0.16, -0.12). The
best-fitting absorption column is consistent with the Galactic value
of 2.0 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed
(unabsorbed) 0.3-10 keV flux conversion factor deduced from this
spectrum is 3.5 x 10^-11 (4.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.0 (+/-0.3) x 10^21 cm^-2
Galactic foreground: 2.0 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index: 2.00 (+0.16, -0.12)
If the light curve continues to decay with a power-law decay index of
0.73, the count rate at T+24 hours will be 8.2 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.8 x
10^-13 (3.8 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00663490.
This circular is an official product of the Swift-XRT team.