{
  "bibcode": "2003GCN..2358....1D",
  "body": "T. Donaghy, C. Graziani, Y. Shirasaki, T. Tamagawa, M. Suzuki, M.\nMatsuoka, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi,\nY. Nakagawa, R. Satoh, Y. Urata, T. Yamazaki and Y. Yamamoto, on\nbehalf of the HETE WXM Team;\n\nG. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley on behalf\nof the HETE Science Team;\n\nG. Prigozhin, N. Butler, G. Crew, J. Doty, A. Dullighan, R. Vanderspek,\nJ. Villasenor, J. G. Jernigan, A. Levine, F. Martel, E. Morgan, G.\nMonnelly, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on\nbehalf of the HETE Operations and HETE Optical-SXC Teams;\n\nC. Barraud, M. Boer, J-F Olive, and J-P Dezalay on behalf  of the HETE\nFREGATE Team;\n\nK. Hurley and T. Cline, on behalf of the Ulysses, HETE, Mars Odyssey,\nand KONUS GRB teams;\n\nI. Mitrofanov, S. Charyshnikov, V. Grinkov, A. Kozyrev, M. Litvak, and\nA. Sanin, on behalf of the HEND-Odyssey GRB team;\n\nW. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on\nbehalf of the GRS-Odyssey GRB team;\n\nE. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team;\n\nA. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL\nSPI-ACS GRB team,\n\nreport:\n\nAt 05:31:50 UTC (19895.60 s UT) on 21 August 2003, the HETE FREGATE\nand WXM instruments detected GRB 030821 (=H2814), a faint long GRB.\n\nThe burst triggered FREGATE in the 25-400 keV energy band.  A GCN burst\nalert was issued 15 s later.  The burst was faint and located at\nthe edge of the FOV of the WXM YB counter; hence no WXM flight\nlocalization was derived.  Ground analysis of the WXM data provided a\nlocalization that was reported in a GCN Notice (Seq. 3) at 08:45:53 UT.\n\nMars Odyssey (HEND), Konus-Wind, and INTEGRAL (SPI-ACS) also observed\nthis burst.  Triangulation of the burst produces a preliminary annulus\ncentered at\n\nRA = 341.285, Dec = -15.283 (J2000),\n\nwhose radius is 32.642 +/- 1.153 degrees (3 sigma).  This annulus does\nnot include the initial (Seq. 3) HETE-2 WXM ground analysis location,\nbut is fully consistent with the revised ground analysis location that\nwas reported in a GCN Notice (Seq. 4) at 22:12:10 UT.  The revised WXM\nground analysis localization can be expressed as a rectangle that is 33\narcminutes wide and 3.3 degrees long, whose center is at\n\nWXM Center-ground:   RA = +21h 42m 33s, Dec = -45d 12' 12\" (J2000).\n\nThe four corners of the WXM localization region are located at the\nfollowing coordinates (J2000):\n\nWXM_CORNER1:    RA = +21h 41m 48s, Dec = -43d 35'  2\"\nWXM_CORNER2:    RA = +21h 45m 58s, Dec = -46d 46' 16\"\nWXM_CORNER3:    RA = +21h 43m 16s, Dec = -46d 49' 23\"\nWXM_CORNER4:    RA = +21h 39m 10s, Dec = -43d 38' 10\"\n\nThe burst was very faint in the SXC X-camera and was outside the FOV of\nthe SXC Y-camera; hence an SXC localization is unlikely.\n\nThe T_90 duration of the burst in the 30-400 keV band was ~ 19 s.  The\npeak photon energy flux in 1 s and the fluence of the burst were 4.8 x\n10-7 ergs cm-2 s-1 and 5.7 x 10-6 ergs cm-2, respectively, in the same\nenergy band.\n\nUlysses data are expected shortly, and may constrain the localization\nfurther.\n\nA light curve and finding chart for GRB030821 are provided at the\nfollowing URL:\n\nhttp://space.mit.edu/HETE/Bursts/GRB030821",
  "circularId": 2358,
  "createdOn": 1061517736000,
  "email": "lamb@oddjob.uchicago.edu",
  "eventId": "GRB 030821",
  "subject": "GRB 030821(=H2814): A Faint, Long GRB Localized by the HETE WXM and the IPN",
  "submitter": "Don Lamb at U.Chicago  <lamb@oddjob.uchicago.edu>"
}