TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2126 SUBJECT: IPN triangulation of GRB050403 (small error box) DATE: 03/04/10 00:17:03 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses, Konus, and HETE GRB teams, E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, I. Mitrofanov, D. Anfimov, 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, G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew, G. Monnelly, N. Butler, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, J. Braga, R. Manchanda, G. Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on behalf of the HETE 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 and GRS), HETE-FREGATE (H2662), INTEGRAL (SPI-ACS), and Konus-Wind observed this GRB at 08248 seconds. As observed by Ulysses, it had a duration of approximately 5 seconds, a 25-100 keV fluence of approximately 4.3E-06 erg/cm2, and a peak flux of approximately 1.0E-06 erg/cm2 s over 0.25 seconds. We have triangulated it to a preliminary, 3 sigma error box whose approximate area is 36 sq. arcmin. and whose coordinates are: RA(2000) DEC(2000) ERROR BOX CENTER: 16 h 33 m 06.33 s -24 o 09 ' 08.86 " ERROR BOX CORNER 1: 16 h 33 m 06.62 s -24 o 07 ' 34.35 " ERROR BOX CORNER 2: 16 h 33 m 58.27 s -23 o 52 ' 17.70 " ERROR BOX CORNER 3: 16 h 32 m 14.93 s -24 o 25 ' 49.05 " ERROR BOX CORNER 4: 16 h 33 m 06.05 s -24 o 10 ' 43.30 " This error box may be improved.