DARTS/Astro Query System User Guide

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How to use "Basic Search"

In Basic Search, you can search for all the data in our database at a time with a simple interface. When "observation area" or "fields of view" of the datasets are defined, lists of the datasets which overlap the searched circular region are returned.

Specify circular region

You need to specify a center position and a radius. There are two ways to specify the center position:

  1. Target Name & Name Resolver ・・・You enter a common object name. You may choose SIMBAD or NED to resolve the coordinates from the object name.
  2. Coordinate & Coordinate System ・・・You specify the coordinate directly. You may choose Equatorial (J2000 or B1950), Ecliptic or Galactic coordinates.

For a Radius, specify a numerical value. Depending on the unit, valid ranges are the following You may specify the numerical value down to the second decimal place (the third decimal place is rounded).

  • degree・・・ 0.01 ~ 180.00
  • arcmin・・・ 0.01 ~ 10,800.00 (= 180.00 x 60)
  • arcsec・・・ 0.01 ~ 648,000.00 (= 180.00 x 60 x 60)

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Judgement of matching

In Basic Search, we return the datasets that match the following criteria:

  • Observation data, where observation region is defined: When the observation region and the circular region overlap, even partially.
  • Observation data, where observation region is NOT defined: When the center position of the observation is included the circular region.
  • Observation log: When the pointing direction is included the circular region.
  • Observation proposal: When the proposed coordinate is included in the circular region.
  • Catalog: When coordinate of the object is included the circular region.

* You may use Equatorial coordinates (J2000 or B1950), Ecliptic coordinates or Galactic coordinates. Please refer to Available Data on Astro Search ⟩⟩ Additional auxiliary database items. About database items of each table, please refer to Searchable data ⟩⟩ each table.

Below, we explain the data products and tables where the observation regions are defined:

Satellite / Detector / Product Observation region Optional selections Explanation of the observation region
AKARI Far-infrared All-Sky Survey Maps Version 2.1 (Public release version 1) Square
(6 degree × 6 degree)
AKARI FIS ALLSKYMAP ver.2.1 All sky data are cut into 6 degree × 6 degree FITS images, where all the image pixels are filled (no margin, so that image corners are FITS corners). Almost all the images are made in the Ecliptic coordinate system, while only polar region images are made in the Equatorial coordinate system (J2000). Coordinate of the four corners of each image are registered in the database.
(22 arcmin radius)
ASCA had have two pairs of two instruments (SIS0, SIS1, GIS2 and GIS3), where all the four instruments point the same direction. Field of view of GIS is round (22 arcmin radius) and always the same. SIS had different observation modes (1CCD mode, 2CCD mode, 4CCD mode), according to which size of the field of view is different. In Basic Search, we adopt the observation region of GIS for simplicity.
GINGA LAC Point or line GINGA OBSERVATION LOG For a "pointing observation", size of the observation region is up to 2 degree × 4 degree, where the collimator response is not uniform (see figure 13 in https://ui.adsabs.harvard.edu/abs/1989PASJ...41..345T). For simplicity, in Basic Search, we use the central coordinates for the pointing observations.
Occasionally there were intentional "scanning observations", where pointing directions are continuously variable from the starting point to the ending point. In such a case, we define the "scan path" connecting the starting point and the ending point. In Basic Search, we check overlap between the scan path and the search region. In both cases, we suggest to use the search radius around 2 degree to search for the pointing data or scanning data.
CCD size of Suzaku XIS is 17 arcmin times 17arcmin. In DARTS/Astro Query System, we register celestial positions of the four corners of the CCD. Note that there are margins in the FITS file around the actual CCD image, so that CCD corners are not FITS corners.
While most of the observation is made with the Normal mode, "Window mode" was occasionally used for bright sources where only a part of the CCD is exposed (xis_window_option=1 or 2; 0 is the Normal mode). Because placements of the four XIS are different, you may see cruciform-like images when you superpose XIS Window mode images on the sky.

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Optional selections

Basically, Basic Search targets all the Searchable Data on Astro Search. Still, you may narrow-down the search targets from the "Show more options" menu.

Search results are shown for each data product, where the data product to display can be chosen from the menu in the left-hand side.

Satellites / Optional selections Targets
AKARI All items of "AKARI"
AKARI PKGINFO Table of AKARI Pointed Observation Raw Data Version 1 (Phase 1&2) and Version 2 (Phase 3) akari_pointed_rawdata_package_info
AKARI FIS BSC ver.1 Table of AKARI FIS All-Sky Survey Bright Source Catalogue Version 1.0 akari_fir_bsc_1
AKARI IRC PSC ver.1 Table of AKARI IRC All-Sky Survey Point Source Catalogue Version 1.0 akari_irc_psc_1
AKARI FIS ALLSKYMAP ver.2.1 Table of AKARI Far-infrared All-Sky Survey Maps Version 2.1 (Public release version 1) akari_fis_allskymap_2_1
ASCA All items of "ASCA"
ASCA OBSERVATION LOG Observation log table of "ASCA" asca_observation_log
ASCA PROPOSAL Observation proposed table about"ASCA" asca_proposal
ASCA SIS BRIGHT MODE The data of SIS BRIGHT MODE in observation proposed table about"ASCA" asca_proposal
ASCA SIS FAINT MODE The data of SIS FAINT MODE in Observation proposed table about "ASCA" asca_proposal
GINGA All items of "GINGA"
GINGA OBSERVATION LOG Observation log table of "GINGA" ginga_observation_log
HALCA All items of "HALCA"
HALCA OBSERVATION LOG Observation log table of "HALCA" halca_observation_log
HALCA VLBA (correletor == 'SOCORRO') The data of VLBA observation(SOCORRO) in observation log table of "HALCA" halca_observation_log
SUZAKU All items of "SUZAKU"
SUZAKU OBSERVATION LOG Observation log table of "SUZAKU" suzaku_observation_log
SUZAKU MASTER DATA Observation data table of"SUZAKU" suzaku_master_data
SUZAKU XIS OBSERVATION LOG Observation log table of"SUZAKU"XIS suzaku_xis_observation_log
SUZAKU XIS PSUM MODE The data that XIS Psum mode is on in observation log table of "SUZAKU"XIS suzaku_xis_observation_log

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Customize the display of search results

Output of the search results of the Basic Search can be customized as below:

  • Format ・・・You can output search result either in HTML format or CSV.
  • Max rows ・・・You can select the maximum number of the search results to display in a single page; 50, 100, 500, 1000, 3000 or10000.
  • Sort ・・・You can choose a column based on which the search results are ordered, either ascending (when "+" is selected) or descending (when "-" is selected).
  • Display・・・You can choose either displaying the "digest" version (only major columns) of the search results or the "full" version (all the columns). All the table columns are explained in Available Data on Astro Search.

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Showing the SQL statement used

Clicking the link "Show the used SQL", the SQL statement used in the search is displayed as a pop-up. You may copy the statement, modify as you like, and paste on to the SQL Search input field. Be careful that the SQL statement displayed here does not have the LIMIT clause.

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Download all data

Clicking the link "Download Wget script", you can get a Wget script to download data.

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Last Modified: 22 April 2021