TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2921 SUBJECT: IPN localization of giant flare from SGR1806-20 DATE: 04/12/29 12:30:42 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses 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, and W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS-Odyssey GRB team, report: The giant flare observed by INTEGRAL (SPI-ACS - GCN 2920) was also detected by Mars Odyssey (GRS). Data from other IPN spacecraft have not been received yet. A very preliminary analysis indicates that the arrival time at Odyssey is indeed consistent with an arrival direction from SGR1806-20. Further analysis is underway and will be reported later.