{
  "bibcode": "2005GCN..3570....1B",
  "body": "N. Butler, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley,\non behalf of the HETE Science Team;\n \nM. Arimoto, T. Donaghy, E. Fenimore, M. Galassi, C. Graziani,\nJ. Kotoku, M. Maetou, M. Matsuoka, Y. Nakagawa, T. Sakamoto, R. Sato,\nY. Shirasaki, M. Suzuki, T. Tamagawa, K. Tanaka, Y. Yamamoto,\nand A. Yoshida, on behalf of the HETE WXM Team;\n \nG. Crew, J. Doty, G. Prigozhin, R. Vanderspek, J. Villasenor,\nJ. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R. Manchanda,\nand G. Pizzichini, on behalf of the HETE Operations and HETE\nOptical-SXC Teams;\n \nM. Boer, J-F Olive, J-P Dezalay, and K. Hurley, on behalf of the HETE\nFREGATE Team;\n \nreport:\n\nThe HETE FREGATE, WXM, and SXC instruments detected GRB 050709 at 22:36:37\nUT (81396.7 SOD) on 9 July 2005.  This was a single hard pulse 100ms long,\nfollowed about 30s later by a soft, faint, approximately 150s long pulse\nfrom the same location.  The later pulse was only detected by WXM and SXC,\nsince the spectrum of its emission was confined to below 10 keV.\n\nThe WXM obtained a localization in flight.  However, the spacecraft\nattitude-control system had experienced an upset approximately 19 minutes\nearlier, so HETE was drifting at the time of the trigger, and real-time\naspect information was not available.  Consequently, the location was not\ndistributed in real time.\n\nGround analysis of the data from the optical cameras has provided reliable\naspect despite the issues associated with the high spacecraft drift rate. \nA GCN Notice was sent out at 22:00:29 UT on 10 July 2005, upon the\nresolution of spacecraft aspect issues.  The 90% confidence region of the\nWXM location may be expressed as a circle centered at\n\n  R.A. = +23h 01m 44s ; Dec. = -38d 59' 52\" (J2000)\n\nwith a radius of 14.5'.\n\nGround analysis of the SXC data yields a refined location with a 90%\nconfidence region that may be expressed as a circle centered at\n\n  R.A. = +23h 01m 30s ; Dec. = -38d 58' 33\" (J2000)\n\nwith a radius of 1.34'.\n\nA preliminary spectral analysis based on a fit of a cutoff power-law model\nto  the initial spike indicates that Epk ~ 90 keV.  The 30-400 keV fluence\nis 1.0E-06 erg cm^-2, while the  2-30 keV fluence is 4.0E-07 keV.  The\nenormously softer character of the tail emission suggests that it may be\npossible to interpret it as the onset of the afterglow of this burst.  If\nthis interpretation is correct, then GRB050709 is a localized short hard\nburst.\n\nA light curve, skymap, and spectral information for GRB 050709 are\nprovided at the following URL:\n\nhttp://space.mit.edu/HETE/Bursts/GRB050709/",
  "circularId": 3570,
  "createdOn": 1121058403000,
  "email": "carlo@oddjob.uchicago.edu",
  "subject": "GRB050709: A Possible Short-Hard GRB Localized by HETE",
  "submitter": "Carlo Graziani at U.Chicago  <carlo@oddjob.uchicago.edu>",
  "eventId": "GRB 050709"
}