TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2378 SUBJECT: IPN triangulation of GRB030903 (large error box) DATE: 03/09/04 17:39:07 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses, Konus, and Mars Odyssey GRB teams, I. Mitrofanov, S. Charyshnikov, V. Grinkov, A. Kozyrev, M. Litvak, and A. Sanin, on behalf of the HEND-Odyssey GRB team, W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS/Odyssey GRB team, E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, and A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, report: Ulysses, Mars Odyssey-HEND, Konus-Wind, and INTEGRAL (SPI-ACS) observed this GRB at 56599 seconds. As observed by Ulysses, it had a duration of approximately 4 seconds, a 25-100 keV fluence of approximately 2E-07 erg/cm2, and a peak flux of approximately 2E-07 erg/cm2 s over 0.25 seconds. We have triangulated it to a preliminary, 3 sigma error box with approximate area 40000 square arcminutes whose coordinates are: RA(2000) DEC(2000) ERROR BOX CENTER: 19 h 50 m 39.16 s -44 o 20 ' 2.33 " ERROR BOX CORNER 1: 19 h 52 m 33.12 s -45 o 33 ' 16.65 " ERROR BOX CORNER 2: 20 h 9 m 57.61 s -52 o 1 ' 52.28 " ERROR BOX CORNER 3: 19 h 42 m 1.51 s -36 o 9 ' 33.02 " ERROR BOX CORNER 4: 19 h 48 m 59.33 s -43 o 6 ' 18.58 " This error box may be improved, but as the Earth, Mars, and Ulysses are practically aligned, a small error box cannot be derived for this event.