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2004ApJ...617.1251V - Astrophys. J., 617, 1251-1257 (2004/December-3)

HETE observations of the gamma-ray burst GRB 030329: evidence for an underlying soft X-ray component.

VANDERSPEK R., SAKAMOTO T., BARRAUD C., TAMAGAWA T., GRAZIANI C., SUZUKI M., SHIRASAKI Y., PRIGOZHIN G., VILLASENOR J., JERNIGAN J.G., CREW G.B., ATTEIA J.-L., HURLEY K., KAWAI N., LAMB D.Q., RICKER G.R., WOOSLEY S.E., BUTLER N., DOTY J.P., DULLIGHAN A., DONAGHY T.Q., FENIMORE E.E., GALASSI M., MATSUOKA M., TAKAGISHI K., TORII K., YOSHIDA A., BOER M., DEZALAY J.-P., OLIVE J.-F., BRAGA J., MANCHANDA R. and PIZZICHINI G.

Abstract (from CDS):

An exceptionally intense gamma-ray burst, GRB 030329, was detected and localized by the instruments on board the High Energy Transient Explorer satellite (HETE) at 11:37:14 UT on 2003 March 29. The burst consisted of two ∼10 s pulses of roughly equal brightness and an X-ray tail lasting more than 100 s. The energy fluence in the 30-400 keV energy band was Sγ=1.2x10–4 ergs/cm2, making GRB 030329 one of the brightest GRBs ever detected. Communication of a 2' error box 73 minutes after the burst allowed the rapid detection of a counterpart in the optical, X-ray, and radio and the ensuing discovery of a supernova with most unusual characteristics. Analyses of the burst light curves reveal the presence of a distinct, bright, soft X-ray component underlying the main GRB; the 2-10 keV fluence of this component is ∼7x10–6 ergs/cm2. The main pulses of GRB 030329 were preceded by two soft, faint, nonthermal bumps. We present details of the HETE observations of GRB 030329.

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Journal keyword(s): Gamma Rays: Bursts - X-rays: individual (GRB 030329)

Simbad objects: 9

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