TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1376 SUBJECT: IPN triangulation of GRB020418 DATE: 02/04/19 09:59:25 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB team; F. Frontera, C. Guidorzi, and E. Montanari, on behalf of the BeppoSAX GRBM team; I. Mitrofanov, D. Anfimov, A. Kozyrev, M. Litvak, and A. Sanin, on behalf of the HEND/Odyssey GRB team; T. Cline, on behalf of the Ulysses and Mars Odyssey GRB teams; W. Boynton, C. Fellows, K. Harshman, C. Shinohara, and R. Starr, on behalf of the GRS/Odyssey GRB team, report: Ulysses, Mars Odyssey - HEND, and BeppoSAX observed this GRB at 31110 s. As observed by Ulysses, it had a duration of ~15 seconds, a 25-100 keV fluence of ~10^-5 erg/cm2, and a peak flux of ~10^-6 erg/cm2 s over 0.25 s. We have triangulated it to a preliminary, 3 sigma error box with approximate area 20 square arcminutes whose coordinates are: RA(2000) DEC(2000) ERROR BOX CENTER: 08 h 00 m 17.58 s -48 o 38 ' 43.64 " ERROR BOX CORNER 1: 08 h 00 m 43.70 s -48 o 38 ' 11.00 " ERROR BOX CORNER 2: 07 h 59 m 43.77 s -48 o 36 ' 59.65 " ERROR BOX CORNER 3: 08 h 00 m 51.42 s -48 o 40 ' 27.43 " ERROR BOX CORNER 4: 07 h 59 m 51.46 s -48 o 39 ' 16.15 " This error box can be improved.