{
  "subject": "Probable SGR or Short Duration GRB Detected by HETE",
  "bibcode": "2001GCN..1089....1R",
  "createdOn": 998516933000,
  "circularId": 1089,
  "submitter": "George Ricker at MIT  <grr@space.mit.edu>",
  "email": "grr@space.mit.edu",
  "body": "Probable SGR or Short Duration GRB Detected by HETE\n\nG. Ricker, D. Lamb, and S. Woosley on behalf of the HETE Science Team;\n\nR. Vanderspek, G. Crew, J. Doty, G. Monnelly, J. Villasenor, N. \nButler, T. Cline, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. \nPrigozhin, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of \nthe HETE Operations and HETE Optical-SXC Teams;\n\nN. Kawai, M. Matsuoka, Y. Shirasaki, T. Tamagawa, K. Torii, T.\nSakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Donaghy, and  C. Graziani, on\nbehalf of the HETE WXM Team;\n\nJ-L Atteia, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf\nof the HETE FREGATE Team;\n\nwrite:\n\nAt 05:06:30.61 UTC (18390.61 s UT) on 22 August, the HETE FREGATE \ninstrument detected a short, intense burst from a probable soft \ngamma-ray repeater or (less likely) a short duration GRB. This event \nwas promptly distributed as a GCN Notice (HETE BID_1715). No signal \nwas detected in the WXM, indicating that the event was likely to \nbe >40 degrees from the anti-sun direction. For the current HETE \npointing direction, SGR1900+14 is about 48 degrees off the boresight, \nwhile SGR1806-20 is about 56 degrees off the boresight, so that \neither could be a candidate.\n\nThe burst duration in the 8-85 keV band was ~200 ms. A total of 500\ncounts were detected during that interval, corresponding to a fluence\nof ~9 x 10-8 ergs cm-2 . The peak flux was >2 x 10-6 ergs cm-2 s-1 \n(ie >50 x Crab flux) over a duration of 30 ms.\n\nA search for this event in the archives of other GRB instruments is \nencouraged. This message is citeable."
}