Amritsar, Punjab: Taking serious note of Prof Darshan Singh concocting a story linking Guru Gobind Singh with a prostitute while doing keertan at gurdwara in New York (USA), Akal Takhat Jathedar Giani Gurbachan Singh summoned Ragi Darshan to Akal Takhat on December 5th, 2009. They decided to summon him after a meeting of Five Singh Sahibans on Nov 17, 2009. Jathedar said that this is a serious issue. Documents regarding this have been obtained from USA.