GCN Circular 1074
Subject
SGR1900+14: Second Burst Localized by HETE
Date
2001-06-28T16:30:28Z (24 years ago)
From
George Ricker at MIT <grr@space.mit.edu>
SGR1900+14: A Burst Localized by HETE
G. Ricker, D. Lamb, and S. Woosley on behalf of the HETE Science Team;
R. Vanderspek, G. Crew, J. Doty, G. Monnelly, J. Villasenor; N.
Butler, T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G.
Pizzichini, and G. Prigozhin, 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, and C. Graziani, 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:
At 15:06:36.51 (54396.51s) UTC on 28 June, the HETE FREGATE and WXM
instruments detected and localized an intense burst from SGR1900+14,
a soft gamma-ray repeater. This event is the third burst reported
from this source in the past week, and the second one reported by
HETE on 28 June. (The previous HETE burst was reported in GCN
Circular #1073.) The coordinates (J2000) of the burst localized by
HETE are:
R.A. = 286.803 deg. (19h07m12s.62)
Dec. = +9.340 deg. (+9:20:22)
The error circle for this localization is 24 arcmin in radius.
SGR1900+14 lies 6.2 arcmin from the HETE position.
The burst duration in the 8-40 keV band was ~400 ms. A total of 4700
counts above background were detected during that interval,
corresponding to a fluence of ~8 x 10-7 ergs cm-2 . The peak flux
was ~4 x 10-6 ergs cm-2 s-1 (ie >150 x Crab flux) during a 5 ms interval.
Follow-up observations of this transient are encouraged.
Additional information on this burst detection (including light
curves), as well as for the HETE mission, will be available at:
http://space.mit.edu/HETE/
Acronyms: HETE=High Energy Transient Explorer
FREGATE=French Gamma Ray Telescope
WXM=Wide Field X-ray Monitor
SXC=Soft X-ray Camera
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