GCN Circular 1169
Subject
GRB011130 (=XRF011130): Revised Localization of an X-ray
Date
2001-12-01T01:05:15Z (23 years ago)
From
George Ricker at MIT <grr@space.mit.edu>
GRB011130 (=XRF011130): Revised Localization of an X-ray Flash/X-ray Rich GRB
G. Ricker, D. Lamb, and S. Woosley on behalf of the HETE Science Team;
N. Butler, G. Crew, J. Doty, G. Monnelly, G. Prigozhin, R.
Vanderspek, J. Villasenor, T. Cline, J.G. Jernigan, A. Levine, F.
Martel, E. Morgan, J. Braga, R. Manchanda, and G. Pizzichini, on
behalf of the HETE Operations and HETE Optical-SXC Teams;
C. Graziani, N. Kawai, M. Matsuoka, Y. Shirasaki, T. Tamagawa, K.
Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner,
and T. Donaghy, on behalf of the HETE WXM Team;
J-L Atteia, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf
of the HETE FREGATE Team;
write:
The localization of H1764, an X-ray flash (XRF) reported as GRB011130
in GCN Circular 1165, has been greatly improved. The burst occurred
at 22775.66 SOD (6:19:35 UT) on 30 November.
Selection by hand of optimal background and foreground time
intervals, and the optimal energy interval has resulted in a 19.6
sigma detection of GRB011130 in the WXM 2-10 keV energy band. The
improved statistical error radius in the WXM localization is 7.2
arcmin (90% confidence). The spacecraft aspect has been improved to
lie within a circle of 3.6 arcmin radius. The revised localization of
H1864 is centered at:
R.A. = 03h05m36s.45, Dec. = 3o48'37"
A circle centered on this location having a radius 10 arcmin contains
the burst location with > 90% confidence.
The revised location differs significantly (~4 degrees) from the
originally reported one; the contributing factors to the large
difference are explained in detail in the "Special Note on Burst
1864" posted at:
http://space.mit.edu/HETE/Bursts/
A careful re-analysis of the full WXM data set indicates that the
burst is considerably longer, and of higher fluence, than reported in
GCN1135. In the 2-10 keV band, the duration is ~30 s, with ~3100
counts contained in the burst.
Further refinement of the spacecraft aspect, and thus the burst
localization, continues.
This message is quotable.