The Simple Cone Search web service conducts a position based search of the Chandra Source Catalog Release 2.1. One specifies the right ascension (RA), declination (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 Release 2.1 Simple Cone Search is

https://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:
  • 1 - select name, ra, dec from csc21.cone
  • 2 - select name, ra, dec, err_ellipse_r0, conf_flag, extent_flag, sat_src_flag, flux_aper_b, flux_aper_lolim_b, flux_aper_hilim_b, flux_aper_w, flux_aper_lolim_w, flux_aper_hilim_w, significance, hard_hm, hard_hm_lolim, hard_hm_hilim, hard_ms, hard_ms_lolim, hard_ms_hilim, var_intra_index_b, var_intra_index_w, var_inter_index_b, var_inter_index_w from csc21.cone
  • 3 - select * from csc21.cone

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 'https://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.