{
  "bibcode": "2004GCN..2579....1B",
  "body": "GRB 040423 (=H3175): A Long GRB Localized by HETE\n\nM. Boer, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, \non behalf of the HETE Science Team;\n\nT. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka, Y. \nNakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki, T. Tamagawa, \nK. Torii, Y. Urata, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on \nbehalf of the HETE WXM Team;\n\nN. Butler, G. Crew, J. Doty, A. Dullighan, G. Prigozhin, R. \nVanderspek, J. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, \nJ. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE \nOperations and HETE Optical-SXC Teams;\n\nJ-F Olive, J-P Dezalay, C. Barraud, and K. Hurley, on behalf of the \nHETE FREGATE Team;\n\nreport:\n\nAt 09:54:35.69 UTC (35675.69s UT) on 2004 April 23, the FREGATE, WXM, \nand SXC instruments on HETE detected trigger H3175, a long GRB.\n\nThe burst triggered in the FREGATE 30-400 keV band.  The flight \nlocalization by WXM was not distributed automatically, due to the low \nimage S/N in the WXM Y-camera.\n\nGround analysis confirmed that the burst was detected and localizable \nwith the WXM X camera, but was out of the field-of-view of the WXM \nY-camera. The burst was also in the SXC field-of-view. Since the \ntrigger time occurred in orbit twilight, scattered sunlight still \ncontaminated a major portion of  SXC CCD area. Nonetheless, an SXC \nX-location, but not a Y-location, was derived from the uncontaminated \nCCD area. Consequently it has been possible to derive an 11-degree by \n3-arcminute 1-dimensional error box, whose long dimension is \nconstrained by the relative count rates observed on the wires of the \nWXM X detector.\n\nThe localization can be expressed as a 90% confidence rectangle whose \ncorners lie at J2000 coordinates:\n\nR.A. = +15h 09m 46.6s, Dec. = -30d 18' 36\"\nR.A. = +15h 03m 54.6s, Dec. = -19d 15' 54\"\nR.A. = +15h 03m 42.0s, Dec. = -19d 16' 27\"\nR.A. = +15h 09m 33.4s, Dec. = -30d 19' 30\"\n\nThe T90 duration of the burst was 30s in the FREGATE 30-400 keV \nenergy band.  The fluence of the burst was 6E-06 erg cm^-2 in the \n25-100 keV band, and the peak flux was 6E-8 erg cm^-2 s^-1 in the \n8-30 keV band.\n\nA light curve, automated spectral fits, and a skymap for GRB040423 \nare provided at the following URL:\n\nhttp://space.mit.edu/HETE/Bursts/GRB040423\n\nThis message may be cited.",
  "circularId": 2579,
  "createdOn": 1082813246000,
  "email": "grr@space.mit.edu",
  "subject": "GRB 040423 (=H3175): A Long GRB Localized by HETE",
  "submitter": "George Ricker at MIT  <grr@space.mit.edu>",
  "eventId": "GRB 040423"
}