TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1078 SUBJECT: SGR1900+14: High Fluence Burst Localized by HETE DATE: 01/07/02 05:29:50 GMT FROM: George Ricker at MIT SGR1900+14: High Fluence 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 03:34:06.53 UTC (12846.53 s UT) on 2 July, the HETE FREGATE and WXM instruments detected and localized an intense burst from SGR1900+14, a soft gamma-ray repeater. This event is the highest fluence burst yet detected by HETE from SGR1900+14 during its current episode of activity. (The first burst in the current series was reported in GCN Circular #1071.) The coordinates (J2000) of the 2 July burst are: R.A. = 286.846 (19h07m23s.1) Dec. = +9.344 (+9o20'40") The error circle for this localization is 12 arcmin in radius. SGR1900+14 lies 4.1 arcmin from the HETE position. The burst duration in the 8-40 keV band was ~4 s. A total of 44000 counts above background were detected during that interval, corresponding to a fluence of ~8 x 10-6 ergs cm-2 . The peak flux was >7 x 10-6 ergs cm-2 s-1 (ie >200 x Crab flux) over a duration of 10 ms. 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.