TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1075 SUBJECT: GRB010629: A Burst Localized by HETE DATE: 01/06/29 21:17:56 GMT FROM: George Ricker at MIT 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 This message is citeable.