GMR Infrastructure, which has bagged the contract for modernising the Delhi international airport, is planning to enter the capital market on July 31 with an intial public offering (IPO) of 3,81,36,980 equity shares of Rs 10 each.The price band of the issue, which closes on August 4, has been fixed at Rs 210- 250 per share.JM Morgan Stanley, DSP Merrill Lynch, Enam Financial Consultants and SSKI Corporate Finance are the book running lead managers for the isssue.