[vsnet-grb-info 5401] GRB 071112C: Swift XRT refined analysis
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Tue Nov 13 23:46:28 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 7079
SUBJECT: GRB 071112C: Swift XRT refined analysis
DATE: 07/11/13 14:46:22 GMT
FROM: Giulia Stratta at ASDC <giulia.stratta at gmail.com>
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G. Stratta (ASDC) , M. Perri (ASDC) and D. N. Burrows (PSU) report
on behalf of the Swift Team:
We have analysed the first 7 orbits of Swift-XRT data obtained
for GRB 071112C (Perri et al. GCN Circ.7059), totaling 281 s
of Windowed Timing (WT) data and 29.1 ks of Photon Counting (PC)
data.
Using 625 s of overlapping XRT Photon Counting mode and UVOT
V-band data, we find an astrometrically corrected X-ray position
(using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue):
RA,Dec =39.21220, 28.37102 which is equivalent to:
RA (J2000): 02 36 50.93
Dec (J2000): +28 22 15.7
with an uncertainty of 1.7 arcsec (radius, 90% confidence).
This is 1.0 arcsec from the previous XRT position, 0.7 arcmin
from the BAT position and 1.0 arcsec from the UVOT position
(Perri et al, GCN Circ. 7059).
The bright X-ray light-curve can be fit by a simple power-law,
with a decay index of 1.35 +/- 0.1.
Between about 400s and 1100s from the trigger, the data deviate
from the model, possibly pointing out a smooth re-brightening.
The WT data (91-372 seconds from trigger) can be modeled as an
absorbed power-law, with photon index of 1.7 +/- 0.1 and a total
absorbing column density consistent with the Galactic value of
NH=7.4e20 cm^-2 (Dickey & Lockmann 1990).
The 0.3-10 keV observed (unabsorbed) flux during this time is
4.4e-10(4.9e-10) erg cm^-2 s^-1.
Assuming the source continues to decay with the same decay
index of 1.35,we predict an XRT count rate of 3.0e-3 counts/s
at T+24 hours, which corresponds to an 0.3-10.0 keV observed
flux of 1.2e-13 ergs cm^-2 s^-1.
This circular is an official product of the Swift-XRT team.
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G. Stratta (ASDC) , M. Perri (ASDC) and D. N. Burrows (PSU) report <br>on behalf of the Swift Team:<br><br>We have analysed the first 7 orbits of Swift-XRT data obtained <br>for GRB 071112C (Perri et al. GCN Circ.7059), totaling 281 s
<br>of Windowed Timing (WT) data and 29.1 ks of Photon Counting (PC) <br>data.<br><br>Using 625 s of overlapping XRT Photon Counting mode and UVOT <br>V-band data, we find an astrometrically corrected X-ray position <br>
(using the XRT-UVOT alignment and matching UVOT field sources
<br>to the USNO-B1 catalogue): <br>RA,Dec =39.21220, 28.37102 which is equivalent to:<br><br>RA (J2000): 02 36 50.93<br>Dec (J2000): +28 22 15.7<br><br>with an uncertainty of 1.7 arcsec (radius, 90% confidence). <br>This is
1.0 arcsec from the previous XRT position, 0.7 arcmin <br>from the BAT position and 1.0 arcsec from the UVOT position <br>(Perri et al, GCN Circ. 7059).<br><br>The bright X-ray light-curve can be fit by a simple power-law,
<br>with a decay index of 1.35 +/- 0.1. <br>Between about 400s and 1100s from the trigger, the data deviate <br>from the model, possibly pointing out a smooth re-brightening.<br><br>The WT data (91-372 seconds from trigger) can be modeled as an
<br>absorbed power-law, with photon index of 1.7 +/- 0.1 and a total <br>absorbing column density consistent with the Galactic value of <br>NH=7.4e20 cm^-2 (Dickey & Lockmann 1990).<br>The 0.3-10 keV observed (unabsorbed) flux during this time is
<br>4.4e-10(4.9e-10) erg cm^-2 s^-1.<br><br>Assuming the source continues to decay with the same decay <br>index of 1.35,we predict an XRT count rate of 3.0e-3 counts/s <br>at T+24 hours, which corresponds to an 0.3-10.0
keV observed
<br>flux of 1.2e-13 ergs cm^-2 s^-1.<br><br>This circular is an official product of the Swift-XRT team.<br><br>
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