{
  "bibcode": "2003GCN..2402....1G",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "createdOn": 1064463105000,
  "subject": "XRF030824 (=H2821):  An X-Ray Flash Localized by the HETE WXM",
  "editedOn": 1777052947926,
  "eventId": "XRF 030824",
  "email": "lamb@oddjob.uchicago.edu",
  "version": 2,
  "circularId": 2402,
  "submitter": "Don Lamb at U.Chicago  <lamb@oddjob.uchicago.edu>",
  "body": "M. Galassi, C. Graziani, Y. Shirasaki, G. Ricker, J-L. Atteia, N.\nKawai, D. Lamb, and S. Woosley on behalf of the HETE Science Team;\n\nT. Donaghy, E. Fenimore, M. Matsuoka, T. Sakamoto, M. Suzuki, T.\nTamagawa, K. Torii, A. Yoshida, Y. Nakagawa, R. Satoh, Y. Urata, T.\nYamazaki and Y. Yamamoto, on behalf of the HETE WXM Team;\n\nA. Dullighan, N. Butler, G. Crew, J. Doty, G. Prigozhin, R. Vanderspek,\nJ. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R.\nManchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE\nOptical-SXC Teams;\n\nM. Boer, J-F Olive, J-P Dezalay, C. Barraud and K. Hurley on behalf of\nthe HETE FREGATE Team;\n\nreport:\n\nAt 16:47:35.10 UTC (60455.10 s UT) on 24 August 2003, the HETE FREGATE\nand WXM instruments detected event H2821, an X-Ray Flash.\n\nThe burst triggered FREGATE in the 6-80 keV energy band.  The WXM\nflight localization was correct, but was not sent to the GCN because\nthe low fluence of the burst and its location at the edge of the WXM\nFOV did not meet the criteria for automatic propagation.  Ground\nanalysis of the WXM data provided a localization that was reported in a\nGCN Notice at 17:47:22 UT, 60 minutes after the burst.  Further ground\nanalysis of the WXM data provided a refined localization that was\nreported in a GCN Notice at 19:13:33 UT.  The refined WXM ground\nlocalization SNR was 6. The refined WXM localization can be expressed\nas a 90% confidence circle, whose radius is 11.2 arcminutes and whose\ncenter is at:\n\nWXM-Ground:  R.A. = +00h 05m 02s, Dec. = +19d 55' 37\" (J2000).\n\nThe SXC had not yet turned on because the burst occurred just before\norbit dusk.\n\nThe T90 duration for the burst was > 16 seconds in the WXM 2-25 keV\nenergy band.  The peak flux of the burst in 1 second is 5.4 x 10-8 erg\ncm-2 s-1 in the 7-30 kev energy band and 2.1 x 10-8 erg cm-2 s-1 in the\n30-400 keV energy band.  The fluence of the burst is 8.9 x 10-7 erg cm-2\nand 5.8 x 10-7 erg cm-2 in the same energy bands, respectively.  Thus\nS(2-30 keV)/S(30-400 keV) = 1.5, making this burst an X-ray flash.\n\nA light curve and skymap for XRF030824 is provided at the following URL:\n\nhttp://space.mit.edu/HETE/Bursts/GRB030824"
}