By Krittivas Mukherjee

NEW DELHI (Reuters) - The Supreme Court granted bail on Monday to Bollywood actor Sanjay Dutt, jailed for six years for receiving guns from gangsters involved in the country's worst bombings.

Dutt, 48, began serving his six year sentence on July 31 in a prison in western India -- less the 16 months he served while awaiting trial over the bomb attacks which killed 257 people in India's commercial capital of Mumbai in 1993.

It was not immediately clear if he would walk free from the jail in Pune on Monday or would have to wait for legal formalities to be completed, Dutt's lawyers said.

The lawyers had petitioned the court against his conviction and sought bail until that petition was ruled on. But they said they could not argue the case as they were yet to get a copy of the judgement of the Mumbai court.

A three-judge bench headed by the chief justice agreed and said that "the nature of the offence and the evidence is very difficult to examine at this stage", and granted bail to Dutt until the lawyers get a copy of the verdict.

An official at the Mumbai court said it could start delivering copies of the sentencing of the 100 people convicted in the case from September. Dutt was among the last of the 100 to be sentenced.

BOLLYWOOD THRILLED

Dutt's appeal said his conviction by a special anti-terrorism court in Mumbai was based on his confession that he had later retracted.

"A retracted confession is a weak piece of evidence," the petition said, arguing that the conviction should also be overturned because no arms or ammunition were ever recovered from Dutt or his home.

The petition, which said Dutt should be granted bail because he was "not likely to commit any offence while on bail", urged the court to award him some form of punishment other than jail.

Bollywood, the world's largest film industry by ticket sales, had backed the actor saying he deserved a second chance because he was impulsive but not dangerous.

On Monday, the industry welcomed his bail.

"It's fantastic news," said top Bollywood producer Ravi Chopra. "He's learnt the lessons he had to learn and now we hope the court takes a lenient view."

Industry analysts hoped that the actor would be out long enough to complete three underproduction films.

"If he is out for, say, 60 days and shoots every day then he should be able to finish them," said Bollywood trade analyst Komal Nahta. "There's about 500 million rupees ($12 million) riding on him."

Dutt, a droopy-eyed, muscular actor, earned fame playing gangsters and the anti-hero and also tried his hand at comedy in recent years.

In jail, he undertook carpentry as prison labour and was paid about half a dollar a day. He ate the frugal jail meals and shared a toilet.

(Additional reporting by Samanwaya Rautray)