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

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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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classification 🌌 astro-ph

keywords burstgrb030329x-raycomponentenergyhetesoftdetected

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

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