The newspaper quoted its sources as further saying that an investigation was underway to assess if yesterday's incident was a "mistake or a deliberate attempt to test Pakistans defence capabilities
There are better ways to check preparedness or reaction time.If they are talking about Surveillance,without any instrumentation on board,then India must have stolen djinn technologies from Pakistan. Dr.Djinn Q Khan must have been responsible.
What was done was actually the "classic" way to check preparedness and gauge reactions. Surveillance Radars will light up and missile or air defence gun control radars will try to lock on after that, radio chatter will indicate the exact position, organisation and plan of the opposing forces et al. Much can be gauged from the electronic emissions that can easily be recorded, exact positions plotted and analysed at leisure. I really would not be surprised if this was actually some kind of a probe and the low fuel explanation was the trump card to sell them a pup.
Instrumentation is never on board the intruding aircraft unless it's a serious elint aircraft. Don't underestimate the RAW. Radar signatures are vital in case the pakis have new equipment in the area. This will help to design counter measures against new threats.
If at all there was any instrumentation in this particular case it would have been on a stand off aircraft at some height and well within the Indian border and far away from prying eyes.
The fighter aircraft call could have been made from any aircraft at any range without the Indian pilot being any the wiser. Accurate position of the chopper with relation to any prominent geographical feature could have been relayed to the "transmitting" aircraft from visual sighting of the chopper to convince the Indian pilot that he was in the cross hairs of an F-16 or whatever.
The pakis are past masters at spinning things well after the fact. Further confusion is added by the fact the Indians and the pakis both operate Cheetahs in this area.