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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2410 SUBJECT: IPN triangulation of GRB031004A (short/hard; annulus) DATE: 03/10/07 21:40:01 GMT FROM: Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu> K. Hurley and T. Cline, on behalf of the Ulysses, HETE, and Mars Odyssey 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, and 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, report: HETE-FREGATE and Mars Odyssey - HEND observed this 0.5 s long event at 73687 s. We have triangulated it to a preliminary annulus centered at RA, Decl(2000) = 334.080, -15.296 degrees, whose radius is 75.364 +/- 0.146 degrees. This annulus passes very close to, but formally excludes, the position of SGR1627-41. However, the spectrum of this burst appears to be hard, so it is most likely a short/hard GRB. This annulus may be constrained and/or improved, but as this event was not observed by Ulysses, a small error box cannot be obtained for it.
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