Background
Observations on the GBT are scheduled using the Dynamic Scheduling System (DSS). The GBT Data Sender queries this system for details about upcoming observations, and sends that data to the OSSDB via the REST API.
Note that while the DSS contains scheduled observations, observers are not constrained to following those stated intentions.
The DSS Database
To learn more about the DSS, please see the following resources:
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The following information is sent as a JSON object to be a site_data entry in the OSS database.
| Key | Type | Value |
|---|---|---|
| obs_id | string | look_period.session.name |
| site_id | string | "gbt" |
| site_lat_deg | float | 38.433129 |
| site_lon_deg | float | -79.839839 |
| site_elev_m | float | 824.0 |
| src_id | string | look_period.session.target.source |
| src_ra_deg_j2000 | float | look_period.session.target.vertical |
| src_dec_deg_j2000 | float | look_period.session.target.horizontal |
| src_radius_deg | float | 0.0 (TBD) |
| trk_rate_ra_deg_per_sec | float | 0.0 (TBD) |
| trk_rate_dec_deg_per_sec | float | 0.0 (TBD) |
| freq_lower_hz | float | period_rx.receiver.freq_low * 1E9 |
| freq_upper_hz | float | period_rx.receiver.freq_hi * 1E9 |
| src_start_utc | timestamp | look_period.start |
| src_end_utc | timestamp | look_period.start + look_period.duration |
| status | string | look_period.state.name |
| notes | string | look_period.session.observing_type.type |