# Statistics

statistical measures of source significance or classification

View the source on GitHub

## Properties

* = required

Name | Type | Description |
---|---|---|

far | number | False alarm rate: the rate of occurrence of non-astrophysical events that are of the same intensity or significance as the current event [Hz] |

rate_snr | number | Rate signal to noise ratio [dimensionless] |

rate_duration | number | Interval over rate signal to noise ratio calculation [s] |

rate_energy_range | array | Low and High energy bounds used in rate signal to noise ratio calculation, if not parsed in Reporter.schema.json, default unit is keV |

image_snr | number | Image signal to noise ratio [dimensionless] |

image_duration | number | Interval over image signal to noise ratio calculation [s] |

image_energy_range | array | Low and High energy bounds used in image signal to noise ratio calculation, if not parsed in Reporter.schema.json, default unit is keV |

p_astro | number | Probability [dimensionless, 0-1] that source is of astrophysical origin |

classification | object | Dictionary mapping mutually exclusive source classes to probabilities between 0 and 1, the sum of all values must be 1. e.g. ({'BNS', 0.9}, {'NSBH', 0.05}, {'BBH', 0.05}) |

properties | object | Dictionary of binary classifiers, each entry is between 0 and 1. e.g. ({'NS', 0.95}, {'REMNANT', 0.3}) |

## Example

```
{
"$schema": "https://gcn.nasa.gov/schema/v3.0.0/gcn/notices/core/Statistics.schema.json",
"far": 0.001,
"rate_snr": 5.2,
"rate_duration": 10,
"rate_energy_range": [
100,
1000
],
"image_snr": 3.1,
"image_duration": 30,
"image_energy_range": [
50,
500
],
"p_astro": 0.8,
"classification": {
"BNS": 0.9,
"NSBH": 0.05,
"BBH": 0.05
},
"properties": {
"NS": 0.95,
"REMNANT": 0.05
}
}
```