The Simple Cone Search web service conducts a position based search of the Chandra Source Catalog. One specifies the RA, DEC, and search radius (SR) in decimal degrees and receives one of three available result sets based on the value of the verbosity (VERB) parameter. The service implements the IVOA Simple Cone Search (v1.03).

The base URL of the Chandra Source Catalog Simple Cone Search is

http://cda.cfa.harvard.edu/csc21scs/coneSearch

The service accepts the following parameters in the HTTP query:

• RA - Right Ascension in decimal degrees
• DEC - Declination in decimal degrees
• SR - Search Radius in decimal degrees
• VERB - Verbosity of the result set. Defaults to 2. The following values are allowed:
  verbosity = 1 reports the source name, ra and dec values from the master source table for each matching source resulting from the cone search - verbosity = 2 reports the master source summary results (the default verbosity level) - verbosity = 3 reports all the columns in the master source table
  • 1 - Reports the source name, ra and dec values from the master source table for each matching source resulting from the cone search
  • 2 - Reports the following properties from the master source table: m.name, m.ra, m.dec, m.err_ellipse_r0, m.conf_flag, m.sat_src_flag, m.significance, m.flux_aper_b, m.flux_aper_lolim_b, m.flux_aper_hilim_b, m.flux_aper_w, m.flux_aper_lolim_w, m.flux_aper_hilim_w, m.extent_flag, m.hard_hm, m.hard_hm_lolim, m.hard_hm_hilim, m.hard_ms, m.hard_ms_lolim, m.hard_ms_hilim, m.var_intra_index_b, m.var_inter_index_b, m.var_intra_index_w, and m.var_inter_index_w
  • 3 - Reports all master source properties

A cone search request may be executed on the Unix command line using the HTTP query syntax with a command-line tool such as cURL or Wget. A VO cone search on the position 246.7925, -24.32027, using a search radius of 1.66 decimal degrees and verbosity level 2, would appear as follows, where we perform the query using Wget:

wget -O out.vot 'http://cda.cfa.harvard.edu/csc21scs/coneSearch?RA=246.7925&DEC=-24.32027&SR=1.66&VERB=2'

Alternatively, a form has been provided which will perform a Simple Cone Search.