As you have mentioned its short sold that means you have already sold 2000 shares of IREDA on Monday without having any shares in demat account. If the shares are bought back before market closes, settlement is happened and the P&L will be calculated based on difference between buy and sell.
In this case as IREDA has hit circuit and the shares are not bought back, so this 2000 shares are short delivered. At end of the day broker has to give the shares to exchange, but as there is no shares in your demat it has to be auction settled. Auction settlement will happen on t+2 days, based on price settled at auction your buy price will be calculated and the P&L will be arrived. But as the scrip is continuosly hitting circuit exchange cant buy back shares at auction and it got closed out. You can check more details on this here:
You would have received the auction settlement contract note in your mail.