TITLE: GCN GRB OBSERVATION REPORT NUMBER: 912 SUBJECT: IPN TRIANGULATION OF GRB010109 DATE: 01/01/10 18:47:06 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 and KONUS-A GRB teams, report: Ulysses, NEAR, KONUS-A and KONUS-WIND observed this GRB at 09485 seconds. As observed by Ulysses and KONUS-A, it had a duration of approximately 8. seconds, a 25-100 keV fluence of approximately 1.4E-05 erg/cm2, and a peak flux of approximately 3.5E-06 erg/cm2 s over 0.25 seconds. Emission was observed up to 5 MeV. We have triangulated it to two alternate, preliminary, 3 sigma error boxes each with approximate area 410. sq. arcmin. whose coordinates are: ERROR BOX CENTER: 22 h 5 m 29.37 s -50 o 31 ' 55.57 " ERROR BOX CORNER 1: 22 h 6 m 49.37 s -50 o 31 ' 49.45 " ERROR BOX CORNER 2: 22 h 10 m 57.99 s -50 o 41 ' 32.36 " ERROR BOX CORNER 3: 21 h 56 m 52.46 s -50 o 16 ' 26.78 " ERROR BOX CORNER 4: 22 h 4 m 2.91 s -50 o 31 ' 49.57 " ERROR BOX CENTER: 21 h 33 m 3.22 s -49 o 31 ' 30.75 " ERROR BOX CORNER 1: 21 h 31 m 50.78 s -49 o 26 ' 41.41 " ERROR BOX CORNER 2: 21 h 27 m 43.53 s -49 o 21 ' 3.49 " ERROR BOX CORNER 3: 21 h 41 m 31.20 s -49 o 47 ' 49.65 " ERROR BOX CORNER 4: 21 h 34 m 22.10 s -49 o 36 ' 32.11 " There is a chance that the ambiguity can be resolved by further processing. These error boxes may be improved.