TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4377 SUBJECT: GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral DATE: 05/12/21 22:25:49 GMT FROM: Don Lamb at U.Chicago GRB 051211A: Evidence This Is a Short Burst from Analysis of Spectral Lag J. Norris, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley, on behalf of the HETE Science Team; M. Arimoto, T. Donaghy, E. Fenimore, M. Galassi, C. Graziani, N. Ishikawa, A. Kobayashi, J. Kotoku, M. Maetou, M. Matsuoka, Y. Nakagawa, T. Sakamoto, R. Sato, T. Shimokawabe, Y. Shirasaki, S. Sugita, M. Suzuki, T. Tamagawa, K. Tanaka, and A. Yoshida, on behalf of the HETE WXM Team; N. Butler, G. Crew, J. Doty, G. Prigozhin, R. Vanderspek, J. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga, R. Manchanda, G. Pizzichini, and S. Gunasekera, on behalf of the HETE Operations and HETE Optical-SXC Teams; M. Boer, J-F Olive, J-P Dezalay, and K. Hurley, on behalf of the HETE FREGATE Team; report: We have performed an analysis of the spectral lag for GRB 051211A, using FREGATE data in the 30-85 keV and 85-400 keV energy bands. We obtain a spectral lag of 0.000 +/- 0.024 seconds. This result provides strong additional evidence that GRB 051211A is a short burst [Norris, J. P., Scargle, J. D., and Bonnell, J. T. 2001, in Gamma-Ray Bursts in the Afterglow Era, ed. E. Costa, F. Frontera, and J. Hjorth (Berlin: Springer), p. 40; and Norris, J. P., and Bonnell, J. T. 2005, ApJ, submitted (see, e.g., Figure 3)].