TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1407 SUBJECT: Refined IPN error box for GRB020531 DATE: 02/06/05 01:26:07 GMT FROM: Kevin Hurley at UCBerkeley/SSL K. Hurley and T. Cline, on behalf of the Ulysses, Mars Odyssey, and HETE GRB teams, I. Mitrofanov, D. Anfimov, 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, G. Ricker, J-L Atteia, N. Kawai, D. Lamb, S. Woosley, J. Doty, R. Vanderspek, J. Villasenor, G. Crew,G. Monnelly, N. Butler, J.G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, J. Braga, R. Manchanda, G. Pizzichini, Y. Shirasaki, C. Graziani, M. Matsuoka, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, T. Donaghy, M. Boer, J-F Olive, and J-P Dezalay, on behalf of the HETE GRB team, report: We have refined the IPN error box of the short duration, hard spectrum GRB020531 (GCN 1402) to the following preliminary 3 sigma polygon with approximately 22 square arcminute area. Its maximum dimension is about 10 arcminutes, which may facilitate deeper searches. 15 h 15 m 03.57 s -19 o 24 ' 51.00 " (CENTER) 15 h 14 m 53.98 s -19 o 24 ' 18.15 " (CORNER) 15 h 15 m 14.46 s -19 o 21 ' 38.39 " (CORNER) 15 h 15 m 17.07 s -19 o 21 ' 35.32 " (CORNER) 15 h 15 m 12.51 s -19 o 25 ' 32.46 " (CORNER) 15 h 14 m 53.75 s -19 o 27 ' 58.57 " (CORNER) 15 h 14 m 49.67 s -19 o 28 ' 03.27 " (CORNER) This error box may be refined further.