yep - so to add to that, if you tell asset radar to scan or make an asset (i.e. not just log), you can make a copy of the above suggested report, and set it to only show new devices detected within the last 5 minutes... and go to 'email alerts' and tell it to send out that report, every 5 minutes (make a new schedule time for that). This query should work, though I haven't tested it with a new device found within that timeframe.
Select Top (1000000) tblAssets.AssetID,
tsysAssetTypes.AssetTypename As Type,
Coalesce(tsysOS.Image, tsysAssetTypes.AssetTypeIcon10) As icon,
tblAssets.AssetName,
tblAssets.Domain,
tblAssets.Username,
tblAssets.Userdomain,
tblAssets.IPAddress,
tblAssets.Description,
tblAssetCustom.Manufacturer,
tblAssetCustom.Model,
tblAssetCustom.Location,
Case
When tsysOS.osname Is Not Null Then tsysOS.osname
When tblLinuxSystem.OSRelease Is Not Null Then tblLinuxSystem.OSRelease
When tblMacOSInfo.SystemVersion Is Not Null Then tblMacOSInfo.SystemVersion
When tsysAssetTypes.AssetType = -1 And Coalesce(tblSccmAsset.OsCaption,
tblSccmAsset.OperatingSystemNameandVersion, '') <> '' Then
Coalesce(tblSccmAsset.OsCaption,
tblSccmAsset.OperatingSystemNameandVersion)
Else ''
End As OS,
tblAssets.SP,
tblAssets.Scanserver,
tblAssets.Firstseen As [Created at],
tblAssets.Lastseen As [Last successful scan]
From tblAssets
Inner Join tblAssetCustom On tblAssets.AssetID = tblAssetCustom.AssetID
Inner Join tsysAssetTypes On tsysAssetTypes.AssetType = tblAssets.Assettype
Inner Join tblState On tblState.State = tblAssetCustom.State
Left Outer Join tsysOS On tblAssets.OScode = tsysOS.OScode
Left Outer Join tblLinuxSystem On tblLinuxSystem.AssetID = tblAssets.AssetID
Left Outer Join tblMacOSInfo On tblMacOSInfo.AssetID = tblAssets.AssetID
Left Outer Join tblSccmAsset On tblSccmAsset.AssetId = tblAssets.AssetID
Where (tblAssets.ScannedBy & 4096 = 4096 And tblAssets.firstseen >
DateAdd(minute, -5, GetDate())) Or
(tblAssets.firstseen > DateAdd(minute, -5, GetDate()) And
tblAssets.LastAssetRadarScan Is Not Null)
Order By tblAssets.Assettype,
tblAssets.AssetName