The subscans table holds the most specific scientific metadata in the archive.
Definition:
Column | Type | Collation | Nullable | Default
------------------+-------------------+-----------+----------+----------------------------------------------
subscan_id | integer | | not null | nextval('subscans_subscan_id_seq'::regclass)scan_id | integer | | not null |
file_id | integer | | |
ost_subscan_id | integer | | |
obstype | character varying | | not null |
starttime | double precision | | not null |
endtime | double precision | | not null |
sourcename | character varying | | not null |
sourcetype | character varying | | not null |
ra | double precision | | not null |
dec | double precision | | not null |
exposure_time | double precision | | not null |
integration_time | double precision | | not null |
receiver_id | integer | | not null |
backend | character varying | | not null |
intent | character varying | | |
configuration_id | integer | | not null |
Indexes:
"subscan_pk" PRIMARY KEY, btree (subscan_id)
Foreign-key constraints:
"configurations_subscans_fk" FOREIGN KEY (configuration_id) REFERENCES configurations(configuration_id) ON UPDATE CASCADE ON DELETE CASCADE
"files_subscans_fk" FOREIGN KEY (file_id) REFERENCES files(file_id) ON UPDATE CASCADE ON DELETE CASCADE
"receivers_subscans_fk" FOREIGN KEY (receiver_id) REFERENCES receivers(receiver_id)
"scans_subscans_fk" FOREIGN KEY (scan_id) REFERENCES scans(scan_id) ON UPDATE CASCADE ON DELETE CASCADE
Referenced by:
TABLE "subscan_intents" CONSTRAINT "subscans_scan_intents_fk" FOREIGN KEY (subscan_id) REFERENCES subscans(subscan_id) ON UPDATE CASCADE ON DELETE CASCADE
TABLE "subscan_data_descriptions" CONSTRAINT "subscans_subscan_data_descriptions_fk" FOREIGN KEY (subscan_id) REFERENCES subscans(subscan_id)
Columns:
subscan_id: an auto-generated id.
scan_id: foreign key linking subscans to scans table.
file_id: foreign key linking subscan to the file that holds the actual data.
ost_subscan_id:the id of this subscan in the Observation Scheduling Tool, if it exists.
obstype: the type of observation that generated this subscan, eg: "POINT", "TRACK", "OTHER".
starttime and endtime: the start and end time of the observation, in mjd.
sourcename: the radio source being observed,
sourcetype: the type of object. in the current data, this is not very useful, as the values are "STAR" or "none".
ra: the central right ascension. Units: Degrees
dec: the central declination. Units: Degrees
exposure_time: the total exposure time of the observation.
integration_time: the temporal resolution.
receiver_id: theoretically the front-end receiver hardware that was used for the observation. in practice, all values are 0. Potential values are in receivers table.
backend: the back end hardware that processed the observation, eg: DCR, GUPPI
intent: a string containing multiple intent codes, eg: "OBSERVE_TARGET CALIBRATE_AMPLI CALIBRATE_FLUX CALIBRATE_PHASE"
configuration_id: the id of the configuration for this observation. see configurations table for details.