TITLE: GCN GRB OBSERVATION REPORT NUMBER: 895 SUBJECT: IPN triangulation of GRB001204 (short/hard) DATE: 00/12/07 01:19:49 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf of the Konus-Wind and NEAR GRB teams, F. Frontera, C. Guidorzi, and E. Montanari, on behalf of the BeppoSAX GRBM team, and E. Mazets and S. Golenetskii, on behalf of the KONUS-WIND GRB team, report: Ulysses and NEAR have only recently emerged from an intense solar proton event lasting approximately two weeks. Ulysses, NEAR, BeppoSAX GRBM, and KONUS-WIND observed this GRB at 28869 seconds. Its spectrum and duration place it firmly in the "short/hard" class of gamma-ray bursts. As observed by Ulysses, it had a duration of <0.5 seconds, a 25-100 keV fluence of approximately 3.7E-7 erg/cm2, and a peak flux of approximately 6.8E-7 erg/cm2 s over 0.5 seconds. We have triangulated it to a preliminary, 3 sigma error box with approximate area 18 square arcminutes, whose coordinates are: ERROR BOX CENTER: 2 h 41 m 8.59 s 12 o 53 ' 46.31 " ERROR BOX CORNER 1: 2 h 41 m 10.35 s 12 o 51 ' 56.95 " ERROR BOX CORNER 2: 2 h 40 m 50.39 s 12 o 51 ' 35.60 " ERROR BOX CORNER 3: 2 h 41 m 26.79 s 12 o 55 ' 57.13 " ERROR BOX CORNER 4: 2 h 41 m 6.83 s 12 o 55 ' 35.67 " Because solar protons were still being recorded by Ulysses, this burst was detected at slightly under 5 sigma significance (statistical only), making it somewhat marginal. However, final consistency checks are now being carried out, and the results will be communicated as soon as they are available.