An algorithm for locating PSF-Like events and computing the centroid in X-ray images

Joanne E. Hill, Chaitanya Cheruvu, Tony F. Abbey, Richard M. Ambrosi, David Nelson Burrows, Alexander D.T. Short, Alan Wells, John Andrew Nousek

Research output: Contribution to journalConference article

6 Citations (Scopus)

Abstract

The Swift X-ray Telescope (XRT)[1] is designed to make astrometric, spectroscopic, and photometric observations of X-ray emission from Gamma-ray Bursts and their afterglows in the energy band 0.2-10 keV. The XRT has a variety of readout modes which it automatically selects in order to observe objects covering 7 orders of magnitude in flux and to extract the maximum possible science from each one, in response to the flux from the burst diminishing. The primary goal of the XRT is to locate the position of the Gamma-Ray Burst to 1 arcsec and to transmit this position to the UVOT and the ground within 100 seconds of the initial observation of the burst. We describe in detail the use of imaging mode and a centroid algorithm to determine the position of the Gamma-Ray Burst with sub-pixel accuracy.

Original languageEnglish (US)
Pages (from-to)1347-1355
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume4851
Issue number2
DOIs
StatePublished - Dec 1 2002
EventX-Ray and Gamma-Ray Telescopes and Instruments for Astronomy - Waikoloa, HI, United States
Duration: Aug 24 2002Aug 28 2002

Fingerprint

X-ray Telescopes
Gamma-ray Bursts
Centroid
centroids
gamma ray bursts
Telescopes
Gamma rays
Burst
X rays
Computing
telescopes
bursts
x rays
Sub-pixel
Diminishing
Fluxes
Covering
afterglows
Imaging
Band structure

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Hill, Joanne E. ; Cheruvu, Chaitanya ; Abbey, Tony F. ; Ambrosi, Richard M. ; Burrows, David Nelson ; Short, Alexander D.T. ; Wells, Alan ; Nousek, John Andrew. / An algorithm for locating PSF-Like events and computing the centroid in X-ray images. In: Proceedings of SPIE - The International Society for Optical Engineering. 2002 ; Vol. 4851, No. 2. pp. 1347-1355.
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abstract = "The Swift X-ray Telescope (XRT)[1] is designed to make astrometric, spectroscopic, and photometric observations of X-ray emission from Gamma-ray Bursts and their afterglows in the energy band 0.2-10 keV. The XRT has a variety of readout modes which it automatically selects in order to observe objects covering 7 orders of magnitude in flux and to extract the maximum possible science from each one, in response to the flux from the burst diminishing. The primary goal of the XRT is to locate the position of the Gamma-Ray Burst to 1 arcsec and to transmit this position to the UVOT and the ground within 100 seconds of the initial observation of the burst. We describe in detail the use of imaging mode and a centroid algorithm to determine the position of the Gamma-Ray Burst with sub-pixel accuracy.",
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An algorithm for locating PSF-Like events and computing the centroid in X-ray images. / Hill, Joanne E.; Cheruvu, Chaitanya; Abbey, Tony F.; Ambrosi, Richard M.; Burrows, David Nelson; Short, Alexander D.T.; Wells, Alan; Nousek, John Andrew.

In: Proceedings of SPIE - The International Society for Optical Engineering, Vol. 4851, No. 2, 01.12.2002, p. 1347-1355.

Research output: Contribution to journalConference article

TY - JOUR

T1 - An algorithm for locating PSF-Like events and computing the centroid in X-ray images

AU - Hill, Joanne E.

AU - Cheruvu, Chaitanya

AU - Abbey, Tony F.

AU - Ambrosi, Richard M.

AU - Burrows, David Nelson

AU - Short, Alexander D.T.

AU - Wells, Alan

AU - Nousek, John Andrew

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AB - The Swift X-ray Telescope (XRT)[1] is designed to make astrometric, spectroscopic, and photometric observations of X-ray emission from Gamma-ray Bursts and their afterglows in the energy band 0.2-10 keV. The XRT has a variety of readout modes which it automatically selects in order to observe objects covering 7 orders of magnitude in flux and to extract the maximum possible science from each one, in response to the flux from the burst diminishing. The primary goal of the XRT is to locate the position of the Gamma-Ray Burst to 1 arcsec and to transmit this position to the UVOT and the ground within 100 seconds of the initial observation of the burst. We describe in detail the use of imaging mode and a centroid algorithm to determine the position of the Gamma-Ray Burst with sub-pixel accuracy.

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