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HETE-2 Localization and Observations of the Short, Hard Gamma-Ray Burst GRB020531 | | D. Q. Lamb
; G. R. Ricker
; J.-L. Atteia
; K. Hurley
; N. Kawai
; Y. Shirasaki
; T. Sakamoto
; T. Tamagawa
; C. Graziani
; J.-F. Olive
; A. Yoshida
; M. Matsuoka
; K. Torii
; E. E. Fenimore
; M. Galassi
; T. Tavenner
; T. Q. Donaghy
; M. Boer
; J.-P. Dezalay
; R. Vanderspek
; G. Crew
; J. Doty
; G. Monnelly
; J. Villasenor
; N. Butler
; J. G. Jernigan
; A. Levine
; F. Martel
; E. Morgan
; G. Prigozhin
; S. E. Woosley
; T. Cline
; I. Mitrofanov
; D. Anfimov
; A. Kozyrev
; M. Litvak
; A. Sanin
; W. Boynton
; C. Fellows
; K. Harshman
; C. Shinohara
; R. Starr
; J. Braga
; R. Manchanda
; G. Pizzichini
; K. Takagishi
; M. Yamauchi
; | | Date: |
10 Jun 2002 | | Subject: | astro-ph | | Abstract: | The {it HETE-2} (hereafter HETE) French Gamma Telescope (FREGATE) and the Wide-field X-ray Monitor (WXM) instruments detected a short ($t_{50} = 360$ msec in the FREGATE 85-300 keV energy band), hard gamma-ray burst (GRB) that occurred at 1578.72 SOD (00:26:18.72 UT) on 31 May 2002. The WXM flight localization software produced a valid location in spacecraft (relative) coordinates. However, since no on-board real-time star camera aspect was available, an absolute localization could not be disseminated. A preliminary localization was reported as a GCN Position Notice at 01:54:22 UT, 88 min after the burst. Further ground analysis produced a refined localization, which can be expressed as a 90% confidence rectangle that is 67 arcminutes in RA and 43 arcminutes in Dec (90% confidence region), centered at RA = +15$^{
m h}$ 14$^{
m m}$ 45$^{
m s}$, Dec = -19$^circ$ 21arcmin 35arcsec (J2000). An IPN localization of the burst was disseminated 18 hours after the GRB (Hurley et al. 2002b). A refined IPN localization was disseminated $approx$ 5 days after the burst. This hexagonal-shaped localization error region is centered on RA = 15$^{
m h}$ 15$^{
m m}$ 03.57$^{
m s}$, -19$^circ$ 24arcmin 51.00arcsec (J2000), and has an area of $approx$ 22 square arcminutes (99.7% confidence region). The prompt localization of this short, hard GRB by HETE and the anti-Sun pointing of the HETE instruments, coupled with the refinement of the localization by the IPN, has made possible rapid follow-up observations of the burst at radio, optical, and X-ray wavelengths. | | Source: | arXiv, astro-ph/0206151 | | Services: | Forum | Review | PDF | Favorites | |
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