TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2500 SUBJECT: IPN triangulation of GRB031219 (large error box) DATE: 03/12/22 16:28:23 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses, Mars Odyssey, and Konus GRB teams, E. Mazets and S. Golenetskii, on behalf of the Konus-Wind GRB team, 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, D. M. Smith, R. P. Lin, J. McTiernan, R. Schwartz, C. Wigger, W. Hajdas, and A. Zehnder, on behalf of the RHESSI GRB team, and A. von Kienlin, G. Lichti, and A. Rau, on behalf of the INTEGRAL SPI-ACS GRB team, report: Konus-Wind, Mars Odyssey (HEND and GRS), RHESSI, and INTEGRAL (SPI-ACS) observed this ~10 s long event at 20344 s. We have triangulated it to a preliminary annulus centered at RA, Decl(2000)= 1.486, +0.348 degrees, whose radius is 53.410 +/- 0.038 degrees (3 sigma). In addition, the Konus ecliptic latitude response limits the arrival directions to a band between ecliptic latitudes -32 and -24 degrees, and RHESSI Earth-blocking eliminates one possible intersection of this band with the annulus. The remaining error box is that section of the annulus between RA, Decl=323, -40 degrees and 331.5, -46.1 degrees. This localization may be improved, but a small error box cannot be derived for this event.