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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2426 SUBJECT: IPN triangulation of GRB031024 (annulus) DATE: 03/10/24 20:30:40 GMT FROM: Kevin Hurley at UCBerkeley/SSL <khurley@sunspot.ssl.berkeley.edu> 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: Ulysses and Mars Odyssey (GRS) observed this burst at 33817 s +/- 55 s (the uncertainty is due to the fact that no near-Earth spacecraft has reported this event yet). From the limited data available at this time, the duration appears to be >~350 s, the 25-100 keV fluence ~5 x 10^-6 erg/cm^2, and the peak flux over 0.5 s ~2 x 10^-6 erg cm^2 s^-1. We have triangulated it to a preliminary annulus centered at RA, Decl.(2000)=168.621, +16.880, whose radius is 65.036 +/- 0.019 degrees (3 sigma). This localization can be improved, particularly if the event was observed by any near-Earth spacecraft.
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