GRB 050117: Simultaneous gamma-ray and X-ray observations with the Swift satellite

J. E. Hill*, D. C. Morris, T. Sakamoto, G. Sato, D. N. Burrows, L. Angelini, C. Pagani, A. Moretti, A. F. Abbey, S. Barthelmy, A. P. Beardmore, V. V. Biryukov, S. Campana, M. Capalbi, G. Cusumano, P. Giommi, M. A. Ibrahimov, J. A. Kennea, S. Kobayashi, K. IokaC. Markwardt, P. Meszaros, P. T. O'Brien, J. P. Osborne, A. S. Pozanenko, M. Perri, V. V. Rumyantsev, P. Schady, D. A. Sharapov, G. Tagliaferri, B. Zhang, G. Chincarini, N. Gehrels, A. Wells, J. A. Nousek

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The Swift Gamma-Ray Burst Explorer performed its first autonomous, X-ray follow-up to a newly detected GRB on 2005 January 17, within 193 seconds of the burst trigger by the Swift Burst Alert Telescope. While the burst was still in progress, the X-ray Telescope obtained a position and an image for an un-catalogued X-ray source; simultaneous with the gamma-ray observation. The XRT observed flux during the prompt emission was 1.1 × 10-8 ergs cm-2 s-1 in the 0.5-10 keV energy band. The emission in the X-ray band decreased by three orders of magnitude within 700 seconds, following the prompt emission. This is found to be consistent with the gamma-ray decay when extrapolated into the XRT energy band. During the following 6.3 hours, the XRT observed the afterglow in an automated sequence for an additional 947 seconds, until the burst became fully obscured by the Earth limb. A faint, extremely slowly decaying afterglow, α=-0.21, was detected. Finally, a break in the lightcurve occurred and the flux decayed with α<-1.2. The X-ray position triggered many follow-up observations: no optical afterglow could be confirmed, although a candidate was identified 3 arcsecs from the XRT position.

Original languageEnglish
Title of host publicationAIP Conference Proceedings
Number of pages4
Publication statusPublished - 2006 May 19
EventGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference - Washington, D.C.
Duration: 2005 Nov 292005 Dec 2


OtherGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference
CityWashington, D.C.


  • Gamma rays: bursts
  • General: gamma-rays, X-rays
  • Individual (GRB 050117)

ASJC Scopus subject areas

  • General Physics and Astronomy


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