TITLE: GCN CIRCULAR NUMBER: 10554 SUBJECT: IPN triangulation of GRB100324B DATE: 10/03/31 00:01:13 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the IPN team, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, W. Boynton, C. Fellows, K. Harshman, H. Enos, and R. Starr, on behalf of the GRS-Odyssey GRB team, S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, and T. Cline, on behalf of the Konus-Wind team, K. Yamaoka, M. Ohno, Y. Hanabata, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada, T. Murakami, and K. Makishima, on behalf of the Suzaku WAM team, V. Connaughton, M. Briggs, and C. Meegan, on behalf of the Fermi GBM team, and J. Goldsten, on behalf of the MESSENGER NS GRB team, report: This bright, long GRB was detected by Fermi (GBM), Suzaku (WAM), Konus-Wind, Mars Odyssey (HEND), and MESSENGER (GRNS) AT 04:07:36 UT on March 24, 2010. We have triangulated it to a preliminary, 38 square arcminute (3 sigma) error box whose coordinates are: RA(2000) Dec(2000) Center 39.672 -19.287 Corners 39.713 -19.311 39.717 -19.449 39.628 -19.123 39.632 -19.262 This error box may be improved. Details of this burst will be presented in forthcoming GCN Circulars.