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

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 (US)
Title of host publicationGAMMA-RAY BURSTS IN THE SWIFT ERA
Subtitle of host publicationSixteenth Maryland Astrophysics Conference
Number of pages4
StatePublished - May 19 2006
EventGAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference - Washington, D.C., United States
Duration: Nov 29 2005Dec 2 2005

Publication series

NameAIP Conference Proceedings
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616


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

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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