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HETE Observations of the Gamma-Ray Burst GRB030329: Evidence for an Underlying Soft X-ray Component

R. Vanderspek·T. Sakamoto·C. Barraud·T. Tamagawa·C. Graziani·M. Suzuki·Y. Shirasaki·G. Prigozhin·J. Villasenor·J. G. Jernigan·G. B. Crew·J. -L. Atteia·K. Hurley·N. Kawai·D. Q. Lamb·G. R. Ricker·S. E. Woosley·N. Butler·J. P. Doty·A. Dullighan·T. Q. Donaghy·E. E. Fenimore·M. Galassi·G. Pizzichini·M . Matsuoka·K. Takagishi·K. Torii·A. Yoshida·M. Boer·J. -P. Dezalay·J. -F. Olive·J. Braga·R. Manchanda
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Abstract

An exceptionally intense gamma-ray burst, GRB030329, was detected and localized by the instruments on board the High Energy Transient Explorer satellite (HETE) at 11:37:14 UT on 29 March 2003. The burst consisted of two \~10s pulses of roughly equal brightness and an X-ray tail lasting >100s. The energy fluence in the 30-400 keV energy band was 1.08e-4 erg/cm2, making GRB030329 one of the brightest GRBs ever detected. Communication of a 2 arcmin error box 73 minutes after the burst allowed the rapid detection of a counterpart in the optical, X-ray, radio and the ensuing discovery of a supernova with most unusual characteristics. Analyses of the burst lightcurves reveal the presence of a distinct, bright, soft X-ray component underlying the main GRB: the 2-10 keV fluence of this component is ~7e-6 erg/cm2. The main pulses of GRB030329 were preceded by two soft, faint, non-thermal bumps. We present details of the HETE observations of GRB030329.

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R. Vanderspek, T. Sakamoto, C. Barraud, T. Tamagawa, C. Graziani, M. Suzuki, Y. Shirasaki, G. Prigozhin, J. Villasenor, J. G. Jernigan, G. B. Crew, J. -L. Atteia, K. Hurley, N. Kawai, D. Q. Lamb, G. R. Ricker, S. E. Woosley, N. Butler, J. P. Doty, A. Dullighan, T. Q. Donaghy, E. E. Fenimore, M. Galassi, G. Pizzichini, M . Matsuoka, K. Takagishi, K. Torii, A. Yoshida, M. Boer, J. -P. Dezalay, J. -F. Olive, J. Braga, R. Manchanda. 2004-12-08. HETE Observations of the Gamma-Ray Burst GRB030329: Evidence for an Underlying Soft X-ray Component. https://doi.org/10.1086/423923

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