GCN Circular 1075

GRB010629: A Gamma-ray 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 12:21:07.75 UTC (44467.75 s UT) on 29 June, the HETE FREGATE and 
WXM instruments detected and localized a bright GRB. The coordinates 
(J2000) of the 29 June burst are:

R.A. = 248.158 deg. (16h32m38s.3)

Dec. =  -18.723 deg. (-18o43'24")

The error circle for this localization is 15 arcmin in radius.

The burst duration in the 8-40 keV band was ~20 s, with two peaks 
separated by ~12 s. A total of ~11600 counts above background were 
detected during that interval, corresponding to a fluence of ~2 x 
10-6 ergs cm-2 . The peak flux was >3 x 10-7 ergs cm-2 s-1 (ie >10 x 
Crab flux).


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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