TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1482 SUBJECT: IPN triangulation of GRB020813 DATE: 02/08/13 23:09:04 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses and HETE GRB teams, T. Cline, on behalf of the Ulysses, HETE, and Konus-Wind 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, 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: Konus-Wind and Mars Odyssey-HEND observed this burst (HETE 2262, GCN 1471). (Ulysses data are being downlinked and should become available within several hours). The triangulation annulus is centered at RA, Decl(2000) = 322.225, -16.080, and has a radius of 24.559 +/- 0.040 degrees. The center line of this annulus lies approximately 28 arcseconds from the optical transient reported by Fox et al. (GCN 1470). Further refinements to this triangulation are possible. This localization is consistent with, and constrains, the HETE WXM error circle; although it does not constrain the HETE SXC position, it serves as a good calibration for the IPN, which should ultimately allow us to constrain systematic uncertainties. A map will be posted shortly at ssl.berkeley.edu/ipn3/020813.