Skewnesss and peak-to-peak magnitude checks

[nsabrams]

• Check if skewness is in the alert packet
• Check if peak-to-peak magnitude or significance is in the packet

[rachel3834]

Reading the ANTARES documentation on the locus properties, we may be able to make use of the following pre-computed parameters:

• feature_beyond_1_std_magn_r [R-band fraction of observations which magnitudes are beyond 1.000e0 standard deviations from the mean magnitude]; there is also feature_beyond_2_std_magn_r and so on for different passbands.
• feature_skew_magn_r R-band skew of magnitude sample]

These properties should be available for every ANTARES locus (they seem to be provided by a built-in ANTARES filter if not from the alert packet) so we can assume they exist

[rachel3834]

I don't see a skew property made available in the list of alert properties. This somewhat makes sense: skewness is a timeseries parameter, so it can only be calculated by associating an alert (single-image detection) with other alerts from the same sky location (locus).

[rachel3834]

That said the feature_beyond_1_std_magn_r is a deviation from a mean which is likely not robust for microlensing events as the peak itself will offset the mean and increase the stddev.