According to Manmohan Verma, the special POCSO advocate, the incident took place on March 2, 2019.
The Raebareli police recently got a tip-off and based on the mobile phone location of the accused, came to know that he was in the hiding in the powerloom town of Bhiwandi.
The incident took place on Sunday in a village under Bhopa Police Station, SHO Subhash Babu said, adding a case was registered against the accused, Shubham and Ashish, who are absconding.
The court imposed a fine of Rs 2.20 lakh on the convict and ordered that he will have to spend additional time in jail if he fails to furnish the amount.
Not satisfied with the panchayat's decision, the girl's family lodged a police complaint, officials said.
The six accused against whom a case has been registered allegedly caught hold of her, took turns to rape her and then beat her up, while her friends were chased away, police said.
The police claimed that the accused had admitted that he lured the girls to the fields with a packet of biscuits and tried to rape them.
The 15-year-old had gone to fetch water from a hand pump on Friday night, when the accused forcibly took her to a hut in the village and allegedly raped her.