{
  "bibcode": "2004GCN..2701....1B",
  "body": "GRB040912 (= H3557):  A Long GRB or XRF Localized by HETE\n\nN. Butler, 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,\nY. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki,\nT. Tamagawa, Y. Urata, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on\nbehalf of the HETE WXM Team;\n\nG. Crew, J. Doty, A. Dullighan, G. Prigozhin, R. Vanderspek,\nJ. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga,\nR. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and\nHETE Optical-SXC Teams;\n\nC. Barraud, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley, on behalf\nof the HETE FREGATE Team;\n\nreport:\n\nAt 14:12:17 UT (13260 SOD) on 12 September 2004, the Fregate and WXM \ninstruments on HETE detected GRB040912 (= H3557), an unusual, long \nX-ray rich GRB or XRF.  The burst has been localized to a circle of \n7' radius centered on\n\nRA = 23h 56m 54s, Dec = -1d 00' 02\" (J2000)\n\nThe burst duration is ~20 seconds in the 7-30 keV band, but the 2-10 \nkeV emission extends for ~150s.  Preliminary analyses of the first 40 \nseconds of burst data show the burst to have Epeak of 58 keV, a 2-30 \nkeV fluence of 7e-7 erg/cms and a 30-400 keV fluence of 4e-7 erg/cm2. \nWhile this analysis shows the burst to be an X-ray rich GRB, we \nexpect the ratio of 2-30/30-400 keV fluence to increase once the \nanalysis of the entire burst is complete, at which time H3557 may be \nre-classified as an XRF.\n\nWe anticipate providing additional spectral information from this \nunusual event in a subsequent GCN Circular.\n\nThis message may be cited.",
  "circularId": 2701,
  "createdOn": 1095030849000,
  "email": "grr@space.mit.edu",
  "subject": "GRB040912 (= H3557):  A Long GRB or XRF Localized by HETE",
  "submitter": "George Ricker at MIT  <grr@space.mit.edu>",
  "eventId": "GRB 040912"
}