TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2238 SUBJECT: GRB030519B (=H2716): Peak Fluxes, Fluences, and Energy Spectrum DATE: 03/05/20 23:25:03 GMT FROM: Don Lamb at U.Chicago D. Lamb, G. Ricker, J-L Atteia, N. Kawai, and S. Woosley on behalf of the HETE Science Team; C. Barraud, M. Boer, J-F Olive, J-P Dezalay, and K. Hurley on behalf of the HETE FREGATE Team; J. Doty, R. Vanderspek, G. Crew, J. Villasenor, G. Monnelly, N. Butler, T. Cline, J. G. Jernigan, A. Levine, F. Martel, E. Morgan, G. Prigozhin, G. Azzibrouck, J. Braga, R. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and HETE Optical-SXC Teams; Y. Shirasaki, C. Graziani, T. Donaghy, M. Matsuoka, M. Suzuki, T. Tamagawa, K. Torii, T. Sakamoto, A. Yoshida, E. Fenimore, M. Galassi, T. Tavenner, Y. Nakagawa, D. Takahashi, R. Satoh, and Y. Urata, on behalf of the HETE WXM Team; write: >From an analysis of the HETE FREGATE data for GRB030519B (=H2716), we find that the peak flux over 5 s is ~ 8 x 10^-7 erg cm-2 s-1 in the 7-30 keV energy band and ~ 7 x 10^-6 erg cm-2 s-1 in the 30-400 keV energy band. Similarly, we find that the fluence of the burst is 7 x 10^-6 erg cm^-2 in the 7-30 keV energy band and ~ 6 x 10^-5 erg cm-2 in the 30-400 keV energy band. Thus this burst is bright and its fluence is large (the latter is in the top 1% of those for all BATSE bursts). In addition, a preliminary spectral analysis of the FREGATE data indicates that the spectral slope of the burst at high (> 100 keV) energies is > -2, and thus E_peak > 400 keV. In GCN Circular 2235 (Lamb et al. 2003), the date of the burst was reported as 3 May 2003 and the width of the WXM localization rectangle was reported as 24 arcminutes. These are incorrect; the date of the burst is 19 May 2003 and the width of the localization rectangle is 17.4 arcminutes. Neither affect the WXM or the HETE/IPN error boxes reported in GCNs 2235 (Lamb et al. 2003) and 2237 (Hurley et al. 2003); the size of the latter is ~35 square arcminutes. Follow-up observations of this burst are strongly encouraged.