ASCASIS ivo://nasa.heasarc/ascasis NASA/GSFC HEASARC Gotthelf, White 2026-06-26 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This preliminary ASCA SIS Source Catalog contains a list of point sources detected by the Solid-state Imaging Spectrometers (SIS) on-board the ASCA Observatory. This catalog was generated by searching for point-like sources in all data available from the HEASARC's ASCA public archive (ASCAPUBLIC) as of 24 Oct 1996; and is populated by both target and serendipitous sources in the SIS field-of-view. For each catalogued source various information is available, which includes the celestial coordinates of the source, the count rate, the significance of detection, and the hardness ratio, total aperture counts, exposure time, and start time of the observation. In addition, a set of three GIF "thumbnail" images is available in the broad (0.5 - 12 keV), soft (2 < keV), and hard (> 2 keV) spectral bands centered on the apparent detection. These images are convenient for accessing the quality of the source detection. The current catalog is preliminary, the goal of the catalog authors being to make the SIS source list available as quickly as possible. To accomplish this, they took an incremental approach and placed their "work in progress" on-line, warts and all. They urge caution in using and citing these preliminary results, as they point out that the information is not, as yet, 100% reliable. This catalog was generated in January 1997 by Drs. Eric Gotthelf and Nicholas White and resulted from their search for point-like sources in all of the then-available SIS data files in the HEASARC's Public ASCA Data Archive as of 24 Oct 1996. The catalog is populated with both targeted and serendipitous sources that were present in the SIS field-of-view. This is a service provided by NASA HEASARC . 1997xisc.conf...31G https://heasarc.gsfc.nasa.gov/W3Browse/all/ascasis.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=ascasis& GET text/xml 180 99999 true 150.8025 -85.2825 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=ascasis GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_ascasis&Action=More+Options&Action=Parameter+Search&ConeAdd=1 https://heasarc.gsfc.nasa.gov/xamin/vo/sia?table=ascasis& GET text/xml+votable POS Search Position in the form "ra,dec" where ra and dec are given in decimal degrees in the ICRS coordinate system. Cutout 150.8025 -85.2825 0.0833333333333333 0.0833333333333333 ASCA 0.0833333333333333 X-ray public ascasis ASCA SIS Source Catalog obsid Observation Identification Number meta.id;obs char nullable name Source Designation (Based on J2000 Position) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable count_rate Broad Band Count Rate ct/s phot.count;em.X-ray.medium float nullable sigma Estimated Significance float nullable hr Estimated Hardness Ratio float nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable ra_1950 Right Ascension, 1950 Equinox degree double nullable start_time Observation Start Time mjd time.start;obs double nullable file_gif GIF File Access Parameter char nullable counts Counts ct phot;em.X-ray.medium int nullable lii Galactic Longitude degree pos.galactic.lon double nullable count_rate_error Broad Band Count Rate Error stat.error;phot.count;em.X-ray.medium float nullable dec_1950 Declination, 1950 Equinox degree double nullable bii Galactic Latitude degree pos.galactic.lat double nullable hr_error Estimated Hardness Ratio Error float nullable exposure Exposure (s) s time.duration;obs.exposure int nullable