TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2713 SUBJECT: GRB040916 (= H3558): Improved Localization from HETE WXM DATE: 04/09/16 04:18:39 GMT FROM: George Ricker at MIT GRB040916 (= H3558): Improved Localization from HETE WXM Y. Yamamoto, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, on behalf of the HETE Science Team; T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka, Y. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki, T. Tamagawa, Y. Urata, T. Yamazaki, and A. Yoshida, on behalf of the HETE WXM Team; N. Butler, G. Crew, J. Doty, A. Dullighan, G. Prigozhin, R. Vanderspek, J. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; C. Barraud, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley, on behalf of the HETE FREGATE Team; report: By utilizing the WXM data from both peaks of GRB040916 (= H3558; Yamazaki et al, GCN2712), the localization of this unusual XRF has been refined to an 90% confidence error box with corners at the following coordinates (J2000): RA = 23 02 01.68, Dec = -05 50 09.6 RA = 23 00 23.76, Dec = -05 37 51.6 RA = 23 00 58.80, Dec = -05 19 51.6 RA = 23 02 36.72, Dec = -05 32 09.6 The area of the error box is 545 square arc minutes. This message may be cited.