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Mission Overview

Kepler-Swift Active Galaxies and Stars Survey (KSwAGS)


Primary Investigator: Krista Lynne Smith

HLSP Authors: Krista Lynne Smith, Betsy Tian

Released: 2019-10-23

Updated: 2019-10-23

Primary Reference(s): Tian et al. (2019) & Smith et al. (2015)

DOI: 10.17909/t9-8aet-1585

Citations: See ADS Statistics

Read Me

The fields surveyed as part of KSwAGS (numbered, in red) compared with the Kepler field-of-view.


The Kepler-Swift Active Galaxies and Stars (KSwAGS) survey of four modules of the original Kepler FOV was conducted by Swift-XRT to find new active galactic nuclei for Kepler monitoring. The X-ray survey results were reported in Smith et al. 2015. Due to the co-aligned UVOT telescope on the Swift spacecraft, an ultraviolet survey of the Kepler field was conducted simultaneously in the uvm2 filter at 2246 Angstroms. The catalog includes the full reduced UV survey. It contains more than three times as many sources as GALEX NUV archival data in the Kepler field, including 17,000 sources with Kepler 30-minute light curves.

Data Products

The catalog file follows this naming convention:



Data file types:

_catalog.fits The KSwAGS catalog of uvm2 sources


The catalog contains 39,725 sources, and includes fluxes, statistical uncertainties, and systematic uncertainties as both magnitudes and fluxes in ergs/s/cm^2/Angstrom.  The statistical uncertainty is the 1-sigma error of the flux or magnitude value. The systematic uncertainty is a parameter added by the HEASARC task "uvotsource" that accounts for the effect of a variable UVOT PSF to the corrected count rate. At the time of the reduction of this survey, this was estimated using a postulated fractional rms variation of the FWHM of a point source of 5%.

Note: The source of magnitude zero-points in the FITS header comes from

Data Access

You may download the KSwAGS catalog in FITS format below.

File Size


2.5 MB



Please remember to cite the appropriate paper(s) below and the DOI if you use these data in a published work. 

Note: These HLSP data products are licensed for use under CC BY 4.0.