Myuran Sukumaran and Andrew Chan are in separate cells, but can talk to each other and a Nigerian prisoner who is also awaiting execution on a penal island in Indonesia.  Ursa Supit, a supporter of Raheem Agbaje Salami, was able to visit the Nigerian on Thursday, a day after he was transferred to Nusakambangan from an east Java jail.  In contrast to the transfer of the Australians from Bali - which happened with overblown military and police security - Salami was taken for a long journey overland in a regular van.  Ms Supit said the men are in a renovated block of four individual cells in Besi prison; each cell has a place to sleep and a toilet.  Salami had been following the "sensational" case of the Bali Nine pair, Ms Supit said, and could talk to them, but couldn't see them.  "They sounded fine, but they have nothing because they had to leave all their stuff in Bali," she told reporters.  No date has been set for the executions, but 72 hours' notice must be given by law.  With Chan and Sukumaran at death's door, the federal government is making its final push to convince Indonesia's president to spare them from execution.  At a dawn vigil in Canberra, Prime Minister Tony Abbott said he was seeking another phone call with Mr Joko.  "Pull back from this brink," he said later in parliament.  Foreign Minister Julie Bishop meanwhile has discussed with her Indonesian counterpart a prisoner swap.  She won't give the details of what was relayed to Retno Marsudi in the "very tense phone call".  Attorney-General HM Prasetyo told news website Detik.com such a deal would be "difficult".  "I think its uncommon," he said. "The offer is irrelevant with what we're doing.  "For sure, it's never been done and never crossed our mind."  Indonesia's Co-ordinating Minister for Politics, Law and Human Rights, Tedjo Edhie Purdjiamto, said he hadn't discussed it with other ministries, but didn't think such an arrangement was possible.  "It's OK that they offered, but we don't go into that domain," he told reporters in Jakarta.  "We've never received that (offer). We will go on."  The minister couldn't confirm a report that President Joko Widodo had indicated the executions of Chan, Sukumaran and up to eight others would not take place this week.  In an interview with broadcaster al Jazeera, Mr Joko said he was considering the "national interest" in pursuing the execution of drug offenders.  He said he couldn't discriminate between people from different countries, whose fate had been determined by the courts.  "I as the president have to follow the constitution, which still allows executions and their verdicts have already been decided by the court."  The president told the reporter off camera that there will be "no executions this week".  His ministers would not confirm this, or any time frame.  Ms Supit gave other clues as to what the Sukumaran and Chan families, who arrived in central Java on Thursday, can expect for their final visits.  The prison is 10 minutes by bus after arriving on the island and there was less security than she imagined.  The human rights advocate met her friend in a small garden, finding him tired but well.  She said it was a clean, "normal jail", but access for visitation was difficult to negotiate.  Ms Supit said the cells were not considered isolation even though they were separate.  The fourth cell in their block was empty, perhaps reserved for Filipina drug mule Mary Jane Fiesta Veloso, who has a bid for a judicial review still being heard.  Like Chan and Sukumaran, Salami is pursuing a legal appeal in the administrative court with a date set for Monday.  Chan, 31, and Sukumaran, 33, were sentenced in 2006 for their parts in a plot to smuggle 8.3kg of heroin from Bali to Australia.  Do you have any news photos or videos?
Myuran Sukumaran and Andrew Chan have spent their first night on Indonesia's "death island" after their transfer from Kerobokan jail.