GCN Circular 15845

K.L. Page (U. Leicester) and C. B. Markwardt (NASA/GSFC) report on
behalf of the Swift-XRT team:

We have analysed 7.8 ks of XRT data for GRB 140215A (Markwardt	et al.
GCN Circ. 15837
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 ),  from 124 s to 18.2 ks after the BAT trigger. The
data comprise 159 s in Windowed Timing (WT) mode with the remainder in
Photon Counting (PC) mode. The enhanced XRT position for this burst was
given by Evans et al. (GCN Circ. 15842
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 ).

The light curve can be modelled with  a power-law decay with a decay
index of alpha=1.21 (+/-0.03).

A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index	of 1.49 (+0.12, -0.07). The
best-fitting absorption column is  consistent with the Galactic value
of 9.7 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a
photon index of 1.91 (+0.18, -0.17) and a best-fitting absorption
column of 1.7 (+/-0.5) x 10^21 cm^-2. The counts to observed
(unabsorbed) 0.3-10 keV flux conversion factor deduced from this
spectrum  is 4.0 x 10^-11 (5.4 x 10^-11) erg cm^-2 count^-1. 

A summary of the PC-mode spectrum is thus:
Total column:	     1.7 (+/-0.5) x 10^21 cm^-2
Galactic foreground: 9.7 x 10^20 cm^-2
Excess significance: 2.5 sigma
Photon index:	     1.91 (+0.18, -0.17)

If the light curve continues to decay with a power-law decay index of
1.21, the count rate at T+24 hours will be 5.1 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.0 x
10^-13 (2.8 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/00586680.

This circular is an official product of the Swift-XRT team.