Multi-Object Search Service Details

We suggest that all users read the FAQ and the Catalina Surveys data usage request before using this data.

Input File Format

The input file format consists of space separated:
ID, RA, Dec and optionally Radius.

Input File without radius:

Bob         123.456 12.345
SDSSJ144000 220.003  22.34
A3          300.0   -32.35
Blah        119.998 22.343
Input File with radius:
Bob         123.456  12.345   0.002
SDSSJ144000 220.0    22.34    0.003
A3          300.0   -32.35    0.005
Blah        119.998  22.343   0.005

The ID is your own unique identifier and is a strict requirement. Right Ascension, Declination and radius values must be in J2000 coordinates and specified in decimal degrees. The radius must be less than 0.02 degrees (72 arcseconds). If you input a value with the radius parameter, that value will be used for all objects. Only 100 coordinate pairs can be obtain from this service at a time.

Output data

The output of the query is returned to either a webpage (html) or
a comma separated ascii file (csv).

Webpage output is limited to 3000 lines.
File output is limited to 40000 lines. 

Since each object may have 200 or more detections, and a large radius 
may contain many objects, it is easy to exceed limits with many objects 
or large radii. Therefore we suggest limiting these. 

Output format


Two separate output formats are available, long and short. The short format 
consists of IDs, Magnitudes, uncertainties in magitude, observation
Modified Julian Dates (MJDs), the decimal RA and Decination of each
detection and a blending flag. The long format includes of most of the
additional parameters from the photometry schema.


Photcat contains all the photometry for the frames that match objects 
in the master frames. This contains the associated master object and 
master frame ID. This also contains a flag to say whether the measurement 
vary WRT the magnitude if the object in the master frame (TVAR).
Ophancat contains the detections that are covered by the master frame 
area but do not match sources detected in the master frames.


This checkbox selects whether the user will be informed about the
result of the queries for each object or not. This selection is
is useful to gauge progress when a long list of objects is given.

The Data Product

This service is solely provided for the investigation astronomical 
sources monitored CSS project and is provided by CRTS.
The service provides source photometry derived from the SExtractor
photometry package. CSS images are all taken unfiltered.
Magnitudes provide here are in V-band. Rough transformation and 
photometric calibration is based on a few 10's to 100's stars within 
each frame. Contact CRTS members for further details to photometry.