Information on Service 'LBCS Calibrator Search'

Further access options are discussed below

This service queries the catalog of calibrators from the LOFAR Long-Baseline Calibrator Survey (LBCS). The LBCS aims to identify sources suitable for calibrating the highest-resolution observations made with the International LOFAR Telescope, which include baselines >1000 km. Suitable sources must contain significant correlated flux density (>50 − 100 mJy) at frequencies around 110–190 MHz on scales of a few hundred milliarcseconds.

For a list of all services and tables belonging to this service's resource, see Information on resource 'LBCS Calibrator Search'

Service Documentation

Overview

You can access this service using:

static -- static (i.e. prepared) data or custom client-side code; probably used to access ancillary files here
form -- allows access via an HTML form
scs.xml -- a standard SCS interface as defined by the IVOA to access catalog-type data; SCS clients use https://vo.astron.nl/lbcs/lobos/cone/scs.xml? to access the service

This service is published as follows:

Within the set(s) local with the renderer form

local means it is listed on our front page, ivo_managed means it has a record in the VO registry.

Input Fields

The following fields are available to provide input to the service (with some renderers, some of these fields may be unavailable):

Name	Table Head	Description	Unit	UCD
DEC	Delta (ICRS)	Declination (ICRS decimal)	deg	pos.eq.dec
hscs_pos	Position/Name	Coordinates (as h m s, d m s or decimal degrees), or SIMBAD-resolvable object	N/A	N/A
hscs_sr	Search radius	Search radius in arcminutes	N/A	N/A
MAXREC	Match limit	Maximum number of records returned. Pass 0 to retrieve service parameters.	N/A	N/A
RA	Alpha (ICRS)	Right Ascension (ICRS decimal)	deg	pos.eq.ra
RESPONSEFORMAT	Output Format	File format requested for output.	N/A	meta.code.mime
SR	Search Radius	Search radius	deg	N/A
VERB	Verbosity	Exhaustiveness of column selection. VERB=1 only returns the most important columns, VERB=2 selects the columns deemed useful to the average user, VERB=3 returns a table with all available columns.	N/A	N/A

Default Output Fields

The following fields are contained in the output by default. More fields may be available for selection; these would be given below in the VOTable output fields.

Name	Table Head	Description	Unit	UCD
BaselineQual	Baselines	N/A	N/A	N/A
decj2000	DEC	Source J2000 Declination, in decimal degrees.	deg	pos.eq.dec;meta.main
ObsDate	Date	N/A	N/A	time.epoch;obs
ObsID	Obs ID	LOFAR Observation ID	N/A	meta.id;meta.main
ObsQual	Quality	N/A	N/A	N/A
ObsTime	Time	N/A	N/A	time.epoch;obs
raj2000	RA	Source J2000 Right Ascension, in decimal degrees.	deg	pos.eq.ra;meta.main

VOTable Output Fields

The following fields are available in VOTable output. The verbosity level is a number intended to represent the relative importance of the field on a scale of 1 to 30. The services take a VERB argument. A field is included in the output if their verbosity level is less or equal VERB*10.

Name	Table Head	Description	Unit	UCD	Verb. Level
ObsID	Obs ID	LOFAR Observation ID	N/A	meta.id;meta.main	1
raj2000	RA	Source J2000 Right Ascension, in decimal degrees.	deg	pos.eq.ra;meta.main	1
decj2000	DEC	Source J2000 Declination, in decimal degrees.	deg	pos.eq.dec;meta.main	1
ObsDate	Date	N/A	N/A	time.epoch;obs	20
ObsTime	Time	N/A	N/A	time.epoch;obs	20
BaselineQual	Baselines	N/A	N/A	N/A	20
ObsQual	Quality	N/A	N/A	N/A	20

VOResource XML (that's something exclusively for VO nerds)

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