| spectral | - | - | |
| 2020-12 | statistics | Statistics | statistical measures of source significance or classification | |
| 2020-12 | reporter | Reporter | Alert Reporter instrument | |
| 2020-12 | redshift | Redshift | Redshift measure of transient | |
| 2020-12 | pointing | Instrument Pointing | Instrument pointing and rotational rates. | |
| 2020-12 | localization | Localization | Localization of transient | |
| 2020-12 | hardnessratio | HardnessRatio | Hardness Ratio parameterization | |
| 2020-12 | geolocbase | Spacecraft Geolocation and McIlwain L | Enables GCN providers to include spacecraft geolocation and McIlwain L-Parameter. | |
| 2020-12 | followup | FollowUp | Schema specific to follow-up cases | |
| 2020-12 | event | Event Information | Name or names of the event | |
| 2020-12 | duration | Duration | - | |
| 2020-12 | distance | Distance | Luminosity Distance | |
| 2020-12 | detectorstatus | DetectorStatus | Status of a specified detector at the time of the alert | |
| 2020-12 | datetime | DateTime | Time descriptions of transient event and observation | |
| 2020-12 | alert | Alert | Alert Information description properties of this notice | |
| 2020-12 | additionalinfo | Comments | Comments that are not summarized elsewhere in schema | |