Prime Minister Narendra Modi on Friday offered prayers at Gurdwara Takht Sri Keshgarh Sahib here.Sporting a saffron headgear, Modi was presented a 'siropa' or robe of honour by the Sikh priests at the historic gurdwara, the second holiest of Sikh shrines after Amritsar's Golden Temple.The 10th Sikh master, Guru Gobind Singh, founded the Khalsa Panth (religion of the pure) at Takht Keshgarh Sahib, 85 km from Chandigarh, in present day Ropar district of Punjab on April 13, 1699.The Prime Minister later participated in a public function to mark the celebration of the 350th birth anniversary of Guru Gobind Singh.