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Helicopter very likely. Police chopper has a huge spot light on its nose. Can explain the relatively slow velocity.
If you were in Lumeah, could also be a military chopper as Holsworthy base is next door, particularly if it was heading east and descending too. These also carry huge spot lights. If there was a southery wind blowing too, you wouldn't hear anything either.
Rescue choppers also carry massive nose-set spot light.
I'd say most likely a military chopper. IF it had its civilian flashing lights on, it is easy enough to miss these if the apparition catches you by surprise.
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