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The seven year Swift-XRT point source catalog (1SWXRT) | | V. D'Elia
; M. Perri
; S. Puccetti
; M. Capalbi
; P. Giommi
; D. N. Burrows
; S. Campana
; G. Tagliaferri
; G. Cusumano
; P. Evans
; N. Gehrels
; J. Kennea
; A. Moretti
; J. A. Nousek
; J.P. Osborne
; P. Romano
; G. Stratta
; | | Date: |
28 Feb 2013 | | Abstract: | Swift is a multi-wavelength observatory specifically designed for gamma-ray
burst (GRB) astronomy that is operational since 2004. Swift is also a very
flexible multi-purpose facility that supports a wide range of scientific fields
such as active galactic nuclei, supernovae, cataclysmic variables, Galactic
transients, active stars and comets. The Swift X-ray Telescope (XRT) has
collected more than 150 Ms of observations in its first seven years of
operations. We present the list of all the X-ray point sources detected in XRT
imaging data taken in photon counting mode during the first seven years of
Swift operations. All these point-like sources, excluding the Gamma-Ray Bursts
(GRB), will be stored in a catalog publicly available (1SWXRT). We consider all
XRT observations with exposure time > 500 s taken in the period 2005-2011. Data
were reduced and analyzed with standard techniques and a list of detected
sources for each observation was produced. A careful visual inspection was
performed to remove extended, spurious and piled-up sources. Positions, count
rates, fluxes and the corresponding uncertainties were computed. We have
analyzed more than 35,000 XRT fields, with exposures ranging between 500 s and
100 ks, for a total exposure time of 140 Ms. The catalog includes ~ 89,000
entries, of which almost 85,000 are not affected by pile-up and are not GRBs.
Since many XRT fields were observed several times, we have a total of ~36,000
distinct celestial sources. We computed count rates in three energy bands:
0.3-10 keV (Full, or F), 0.3-3 keV (Soft, or S) and 2-10 keV (Hard, or H). Each
entry has a detection in at least one of these bands. In particular, we detect
~ 80,000, ~ 70,000 and ~ 25,500$ in the F, S and H band, respectively. Count
rates were converted into fluxes in the 0.5-10, 0.5-2 and 2-10 keV bands. Some
possible scientific uses of the catalog are also highlighted. | | Source: | arXiv, 1302.7113 | | Services: | Forum | Review | PDF | Favorites | |
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