TITLE: GCN GRB OBSERVATION REPORT NUMBER: 865 SUBJECT: IPN TRIANGULATION OF GRB001025B (SHORT/HARD) DATE: 00/10/27 00:40:45 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley, on behalf of the Ulysses GRB team, T. Cline, on behalf of the Konus-Wind and NEAR GRB teams, and E. Mazets, and S. Golenetskii, on behalf of the KONUS-WIND GRB team, report: Ulysses, NEAR, and KONUS-WIND observed this GRB at 71369 seconds. As observed by Ulysses, it had a duration of < 0.25 seconds, a 25-100 keV fluence of approximately 2E-07 erg/cm2, and a peak flux of approximately 8E-07 erg/cm2 s over 0.25 seconds We have triangulated it to a preliminary, 3 sigma error whose approximate area is 110. sq. arcmin. and whose coordinates are: RA(2000) DEC(2000) ERROR BOX CENTER: 18 h 21 m 40.78 s -5 o 8 ' 34.45 " ERROR BOX CORNER 1: 18 h 21 m 26.96 s -5 o 8 ' 54.58 " ERROR BOX CORNER 2: 18 h 22 m 56.09 s -5 o 22 ' 40.46 " ERROR BOX CORNER 3: 18 h 20 m 26.72 s -4 o 54 ' 38.26 " ERROR BOX CORNER 4: 18 h 21 m 54.61 s -5 o 8 ' 14.39 " The duration and energy spectrum of this event place it clearly in the short/hard category. We add one note of caution: this burst was detected by Ulysses with a significance of only 4.5 sigma (statistical), which is at the limit of a reliable detection. This error box may be improved