TITLE:   GCN CIRCULAR
NUMBER:  33626
SUBJECT: GRB 230414B: Swift-XRT refined Analysis
DATE:    23/04/15 05:39:47 GMT
FROM:    Phil Evans at U of Leicester  <pae9@leicester.ac.uk>

M.G. Bernardini (INAF-OAB), E. Ambrosi	(INAF-IASFPA) , J. D. Gropp
(PSU), S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester),
A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), M. Capalbi
(INAF-IASFPA) and A. D'Ai report on behalf of the Swift-XRT team:

We have analysed 6.2 ks of XRT data for GRB 230414B (D'Ai et al. GCN
Circ. 33612), from 112 s to 34.3 ks after the  BAT trigger. The data
comprise 17 s in Windowed Timing (WT) mode (the first 10 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The enhanced XRT position for this burst was given by Goad et al.
(GCN Circ. 33613). The late-time light curve (from T0+4.4 ks) is
consistent with a constant source of mean count rate 2.2e-01 ct/sec. A
power-law fit gives an index of -0.07 (+/-0.15).

A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.97 (+0.16, -0.10). The
best-fitting absorption column is  1.74 (+3.05, -0.07) x 10^20 cm^-2,
consistent with the Galactic value of 1.7 x 10^20 cm^-2 (Willingale et
al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux
conversion factor deduced from this spectrum  is 3.2 x 10^-11 (3.4 x
10^-11) erg cm^-2 count^-1. 

A summary of the PC-mode spectrum is thus:
Total column:	     1.74 (+3.05, -0.07) x 10^20 cm^-2
Galactic foreground: 1.7 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.97 (+0.16, -0.10)

The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/01164180.

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