GCN Circular 5602
Subject
GRB 060923B: Swift XRT Refined Analysis
Event
Date
2006-09-24T00:24:19Z (20 years ago)
From
Milvia Capalbi at ISAC/ASDC <capalbi@asdc.asi.it>
M. Capalbi, M. Perri , M.L. Conciatore (ASDC), D.N. Burrows (PSU) and M.
Stamatikos (NASA/ORAU) report on behalf of the Swift XRT team:
We have analysed the first 2 orbits of XRT data from GRB 060923B
(Stamatikos et al., GCN Circ. 5590) with a total exposure of 2.1ks in
photon counting mode. The refined position is:
RA(J2000) = 15h 52m 46.83s,
Dec(J2000) = -30d 54m 11.9s
with an uncertainty of 6 arcsec (90% containment). This position is 0.7
arcsec from the one calculated from early downlinked data (Stamatikos et
al., GCN Circ. 5590).
The 0.3-10.0 keV X-ray light curve can be fit with a single power-law
with a slope of -0.7+/-0.1.
A power-law fit to the X-ray spectrum from T + 125s to T + 365s gives a
photon index of 1.7+/-0.5, fixing the hydrogen column density to the
galactic value in the direction of the burst (8.8e20cm**-2). The
0.3-10.0 keV observed flux is 8.5e-12 ergs cm**-2 s**-1, which
corresponds to an unabsorbed flux of 8.9e-12 ergs cm**-2 s**-1.
If the burst continues decaying at the current rate we estimate an XRT
count rate of 0.014 counts/s at T + 24hr, which corresponds to an
observed 0.3-10.keV flux of 5.6e-13 ergs cm**-2 s**-1.
This circular is an official product of the Swift XRT Team.