Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 5712

GRB 061007: Swift XRT refined analysis
2006-10-07T21:21:39Z (18 years ago)
Loredana Vetere at PSU <>
L. Vetere, C. Pagani, D. N. Burrows (PSU) and P. Schady (MSSL-UCL) report on
behalf of the Swift XRT team:

We have analysed the first 3 orbits of XRT data from GRB 061007. This is one of
the brightest GRB afterglow ever observed by XRT.
A 5.2ks photon counting mode image provides a refined XRT position:

RA(J2000)  =  03 05 19.1
Dec(J2000) = -50 30 01.5

with an uncertainty of 5 arcsec (90% containment). This position is 3.8 arcsec
away from the on-board XRT position and 4 arcsec away from UVOT position
(Schady et al. GCN 5707).

The X-ray light curve shows a rapid decay with a slope of -1.6 +/-0.1. A
power-law fit to the WT spectrum gives a photon index of  2.36 +/- 0.2 and a
column density of (2.2 +/- 0.2)e21 cm**-2. We note the galactic hydrogen column
density in the direction of the burst is  2.13e20cm**-2. The 0.2-10.0 keV
observed mean flux during WT observation is 1.46e-07 ergs cm**-2 s**-1, which
corresponds to an unabsorbed flux of 2.98e-07 ergs cm**-2 s**-1.

If the burst continues decaying at the current rate we estimate an XRT
count rate of 0.0069 counts/s at T + 24hr, which corresponds to an
observed 0.2-10.keV flux of 5.7e-11 ergs cm**-2 s**-1.

This circular is an official product of the Swift XRT Team.
Looking for U.S. government information and services? Visit