Burrows 2008 XRT Observation statistics

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· arXiv e-print (arXiv:0803.1844)

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Title:		The Swift X-Ray Telescope: Status and Performance
Authors:		Burrows, David N.; Kennea, J. A.; Abbey, A. F.; Beardmore, A.; Campana, S.; Capalbi, M.; Chincarini, G.; Cusumano, G.; Evans, P. A.; Hill, J. E.; Giommi, P.; Goad, M.; Godet, O.; Moretti, A.; Morris, D. C.; Osborne, J. P.; Pagani, C.; Page, K. L.; Perri, M.; Racusin, J.; Romano, P.; Starling, R. L. C.; Tagliaferri, G.; Tamburelli, F.; Tyler, L. G.; Willingale, R.
Publication:		eprint arXiv:0803.1844
Publication Date:		03/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		9 pages, 14 figures; Proc. SPIE, ed. O. H. W. Siegmund, Vol. 6686, p. 668607-1 to 668607-9, (2007)
Bibliographic Code:		2008arXiv0803.1844B

Abstract

We present science highlights and performance from the Swift X-ray Telescope (XRT), which was launched on November 20, 2004. The XRT covers the 0.2-10 keV band, and spends most of its time observing gamma-ray burst (GRB)afterglows, though it has also performed observations of many other objects. By mid-August 2007, the XRT had observed over 220 GRB afterglows, detecting about 96% of them. The XRT positions enable followup ground-based optical observations, with roughly 60% of the afterglows detected at optical or near IR wavelengths. Redshifts are measured for 33% of X-ray afterglows. Science highlights include the discovery of flaring behavior at quite late times, with implications for GRB central engines; localization of short GRBs, leading to observational support for compact merger progenitors for this class of bursts; a mysterious plateau phase to GRB afterglows; as well as many other interesting observations such as X-ray emission from comets, novae, galactic transients, and other objects.

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