Of the four convicts who will face the gallows, Mukesh (29), Pawan (22) and Akshay Kumar Singh (31) are kept in jail number two, while Vinay Sharma (23) is lodged in jail number four, a senior Tihar Jail official said.
One of the accused, Ram Singh, had allegedly committed suicide in Tihar Jail, while a convicted juvenile was sentenced to three years of punishment in a reform home.
However, in view of the confirmation of their death sentence, the jail authorities have ensured round-the-clock watch on all of them through CCTV cameras. Also, warders in the jails, where they are lodged, have been instructed to report any change in their "mood or behaviour", he said.
The inmates and jail staff, including warders, have been in touch with the four convicts and are trying to instill "positive outlook" in them, another official who met the convicts said.
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All the four convicts have been visited by their family members at "infrequent intervals", he said.
The jail authorities have been ensuring regular medical check-ups of the four convicts to detect any sign of depression as Vinay had allegedly attempted suicide last year.
"He is being watched with extra care as he has a history of depression and also because he had tried to hang himself in the jail in August last year," the official said.
The Supreme Court today confirmed the death sentence awarded to the four convicts in the December 16, 2012 gangrape and murder case, saying it had sent a "tsunami of shock" all over and was a 'rarest of rare' case.
The 23-year-old paramedic student was gangraped on the intervening night of December 16-17, 2012 inside a moving bus in South Delhi by a gang of six persons and severely assaulted before being thrown out naked. She succumbed to her injuries on December 29 at Mount Elizabeth Hospital in Singapore.