Joanne E. Hill et al. 2006 ApJ 639 303 doi:10.1086/498443
Joanne E. Hill1,2, David C. Morris3, Takanori Sakamoto1, Goro Sato4, David N. Burrows3, Lorella Angelini1,5, Claudio Pagani3,6, Alberto Moretti6, Antony F. Abbey7, Scott Barthelmy1, Andrew P. Beardmore8, Vadim V. Biryukov9, Sergio Campana6, Milvia Capalbi10, Giancarlo Cusumano11, Paolo Giommi10, Mansur A. Ibrahimov12, Jamie Kennea3, Shiho Kobayashi3,13, Kunihito Ioka3,13, Craig Markwardt1, Peter Mészáros3, Paul T. O'Brien8, Julian P. Osborne8, Alexei S. Pozanenko14, Matteo Perri10, Vasilij V. Rumyantsev15, Patricia Schady16, Dmitri A. Sharapov12, Gianpiero Tagliaferri6, Bing Zhang17, Guido Chincarini6,18, Neil Gehrels1, Alan Wells3,7 and John A. Nousek3
Show affiliationsThe Swift Gamma-Ray Burst Explorer performed its first autonomous, X-ray follow-up to a newly detected GRB on 2005 January 17, within 193 s of the burst trigger by the Swift Burst Alert Telescope. While the burst was still in progress, the X-Ray Telescope (XRT) obtained a position and an image for an uncataloged X-ray source simultaneously 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 3 orders of magnitude within 700 s, 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 hr, the XRT observed the afterglow in an automated sequence for an additional 947 s, 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 light curve 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'' from the XRT position.
Issue 1 (2006 March 1)
Received 2005 July 13, accepted for publication 2005 September 28
Joanne E. Hill et al. 2006 ApJ 639 303
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