- ID:
- ivo://CDS.VizieR/J/ApJS/186/378
- Title:
- Hard X-ray survey from Swift-BAT 2004-2006
- Short Name:
- J/ApJS/186/378
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the catalog of sources detected in the first 22 months of data from the hard X-ray survey (14-195keV) conducted with the Burst Alert Telescope (BAT) coded mask imager on the Swift satellite. The catalog contains 461 sources detected above the 4.8{sigma} level with BAT. High angular resolution X-ray data for every source from Swift-XRT or archival data have allowed associations to be made with known counterparts in other wavelength bands for over 97% of the detections, including the discovery of ~30 galaxies previously unknown as active galactic nuclei and several new Galactic sources. A total of 266 of the sources are associated with Seyfert galaxies (median redshift z~0.03) or blazars, with the majority of the remaining sources associated with X-ray binaries in our Galaxy. This ongoing survey is the first uniform all-sky hard X-ray survey since HEAO-1 in 1977 (Fishman G.J., 1977IAUC.3134....1F). Since the publication of the nine-month BAT survey (Tueller, 2008, Cat. <J/ApJ/681/113>) we have increased the number of energy channels from four to eight and have substantially increased the number of sources with accurate average spectra. The BAT 22 month catalog is the product of the most sensitive all-sky survey in the hard X-ray band, with a detection sensitivity (4.8{sigma}) of 2.2x10^-11^erg/cm^2^/s (1mCrab) over most of the sky in the 14-195keV band.
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- ID:
- ivo://CDS.VizieR/J/ApJS/207/19
- Title:
- Hard X-ray survey from Swift-BAT 2004-2010
- Short Name:
- J/ApJS/207/19
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the catalog of sources detected in 70 months of observations with the Burst Alert Telescope (BAT) hard X-ray detector on the Swift gamma-ray burst observatory. The Swift-BAT 70 month survey has detected 1171 hard X-ray sources (more than twice as many sources as the previous 22 month survey) in the 14-195 keV band down to a significance level of 4.8{sigma}, associated with 1210 counterparts. The 70 month Swift-BAT survey is the most sensitive and uniform hard X-ray all-sky survey and reaches a flux level of 1.03x10^-11^erg/s/cm2 over 50% of the sky and 1.34x10^-11^erg/s/cm2 over 90% of the sky. The majority of new sources in the 70 month survey continue to be active galactic nuclei, with over 700 in the catalog.
- ID:
- ivo://CDS.VizieR/J/ApJS/235/4
- Title:
- The 105-month Swift-BAT all-sky hard X-ray survey
- Short Name:
- J/ApJS/235/4
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present a catalog of hard X-ray sources detected in the first 105-months of observations with the Burst Alert Telescope (BAT) coded-mask imager on board the Swift observatory. The 105-month Swift-BAT survey is a uniform hard X-ray all-sky survey with a sensitivity of 8.40x10^-12^erg/s/cm^2^ over 90% of the sky and 7.24x10^-12^erg/s/cm^2^ over 50% of the sky in the 14-195keV band. The Swift-BAT 105-month catalog provides 1632 (422 new detections) hard X-ray sources in the 14-195 keV band above the 4.8{sigma} significance level. Adding to the previously known hard X-ray sources, 34% (144/422) of the new detections are identified as Seyfert active galactic nuclei (AGNs) in nearby galaxies (z<0.2). The majority of the remaining identified sources are X-ray binaries (7%, 31) and blazars/BL Lac objects (10%, 43). As part of this new edition of the Swift-BAT catalog, we release eight-channel spectra and monthly sampled light curves for each object in the online journal and at the Swift-BAT 105-month website.
- ID:
- ivo://CDS.VizieR/J/ApJ/868/47
- Title:
- The 1st year of the Swift SMC Survey (S-CUBED)
- Short Name:
- J/ApJ/868/47
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The Swift Small Magellanic Cloud (SMC) Survey, S-CUBED, is a high-cadence shallow X-ray survey of the SMC. The survey consists of 142 tiled pointings covering the optical extent of the SMC, which is performed weekly by NASA's Neil Gehrels Swift Observatory, with an exposure per tile of 60s. The survey is focused on discovery and monitoring of X-ray outbursts from the large known and unknown population of Be/X-ray binaries (BeXRBs) in the SMC. Given the very low background of Swift's X-ray telescope, even with a short exposure per tile, S-CUBED is typically sensitive to outbursts in the SMC at >1%-2% Eddington luminosity for a typical 1.4M_{sun}_ neutron star compact object. This sensitivity, combined with the high cadence and the fact that the survey can be performed all year round, makes it a powerful discovery tool for outbursting accreting X-ray pulsars in the SMC. In this paper we describe results from the first year of observations of S-CUBED, which includes the 1SCUBEDX catalog of 265 X-ray sources, 160 of which are not identified with any previously cataloged X-ray source. We report on bulk properties of sources in the 1SCUBEDX catalog. Finally, we focus on results of S-CUBED observations of several interesting sources, which includes discovery of three Type II outbursts from BeXRBs and the detection of Type I outbursts and orbital periods in six BeXRB systems.
