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 1194

GRB011212 (=H10001): An X-Ray Rich GRB Detected by HETE
2001-12-12T14:19:13Z (22 years ago)
Don Lamb at U.Chicago <>
GRB011212 (=XRF011212) (=H10001): An X-ray Flash/X-ray Rich GRB Detected by

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;

N. Kawai, M. Matsuoka, Y. Shirasaki, T. Tamagawa, K. Torii,
T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner,
C. Graziani, 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;


The HETE Fregate and WXM instruments have detected and localized a
burst at 14642.00 SOD {04:04:02.00} UT on 12 December.  The burst was
an untriggered event, and appears to be an X-ray rich GRB with a
duration of > 80 seconds.

In the Fregate 8-85 keV band, the statistical significance was 9.8
sigma. A total of 3724 counts were detected during that interval,
corresponding to a fluence of ~6.7 x 10-7 cm-2. The peak flux was
~1.8 x 10-8 ergs cm-2 s-1 (i.e., ~0.5 x Crab flux), assuming a
Crab-like spectrum. In the WXM 2-25 keV band, the statistical
significance was 6.9 sigma.

Based on the WXM data, the best fit location for GRB011019 is:

RA = 05h00m05s, Dec = +32o07'39"

with a total error radius of 11 arcminutes (90% confidence region).

The duration in the WXM 2-10 keV band was > 80 s. A total of ~3500
counts were detected during that interval.

Further refinement of the burst localization is in progress.

This message is quotable.
Looking for U.S. government information and services? Visit