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HETE-2 Localization and Observation of the Bright, X-Ray-Rich Gamma-Ray Burst GRB021211 | | G. B. Crew
; D. Q. Lamb
; G. R. Ricker
; J.-L. Atteia
; N. Kawai
; R. Vanderspek
; J. Villasenor
; J. Doty
; G. Prigozhin
; J. G. Jernigan
; C. Graziani
; Y. Shirasaki
; T. Sakamoto
; M. Suzuki
; N. Butler
; K. Hurley
; T. Tamagawa
; A. Yoshida
; M. Matsuoka
; E. E. Fenimore
; M. Galassi
; C. Barraud
; M. Boer
; J.-P. Dezalay
; J.-F. Olive
; A. Levine
; G. Monnelly
; F. Martel
; E. Morgan
; T. Q. Donaghy
; K. Torii
; S. E. Woosley
; T. Cline
; J. Braga
; R. Manchanda
; G. Pizzichini
; K. Takagishi
; M. Yamauchi
; | | Date: |
20 Mar 2003 | | Journal: | Astrophys.J. 599 (2003) 387-393 | | Subject: | astro-ph | | Abstract: | A bright, x-ray-rich GRB was detected by HETE-2 at 11:18:34.03 UT on 11 Dec 2002. The WXM localization was to 14’ and relayed to the GCN 22 s after the start of the burst. The ground SXC localization was within 2’ of R.A. 08h 09m 00s, Dec 06d 44’ 20" (J2000). GRB021211 consists of a single, FRED-like pulse with t90s of 2.3 s (85-400 keV) and 8.5 s (2-10 keV). The peak photon number and photon energy fluxes in the 2-400 keV band, are 34.0 +/- 1.8 ph cm^-2 s^-1 and 1.68 +/- 0.11 x 10^-6 erg cm^-2 s^-1, respectively. The energy fluences in the 2-30 keV and 30-400 kev energy bands are S_X = 1.36 +/- 0.05 x 10^-6 erg cm^-2 and S_gamma 2.17 +/- 0.15 x 10^-6 erg cm^-2, respectively. Thus GRB021211 is an X-ray-rich GRB (S_X/S_gamma = 0.63 > 0.32). The spectrum is well-fit by a Band function (alpha = -0.805, beta = -2.37, E_peak = 46.8 keV). The prompt localization allowed the detection of an optical afterglow for what would otherwise have been an ``optically dark’’ GRB. GRB 021211 demonstrates that some fraction of burst afterglows are ``optically dark’’ because their optical afterglows at times > 1 hr after the burst are very faint, and thus have often escaped detection. GRB 021211 shows that such ``optically dim’’ bursts can have very bright afterglows at times < 20 min after the burst. | | Source: | arXiv, astro-ph/0303470 | | Services: | Forum | Review | PDF | Favorites | |
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