Christchurch mosque gunman Brenton Tarrant has been sentenced to life imprisonment - with no possibility of parole.

It means he will never be free.

The 29-year-old Australian has just been sentenced in the High Court at Christchurch on 51 murder charges, 40 attempted murder charges and one terrorism charge.

Tarrant made a submission via standby counsel, saying he did not oppose life imprisonment with no parole.

When asked if he wanted to address the court, he said no thank you.

It’s the first time in New Zealand history this sentence has been imposed.

Newstalk ZB's Chelsea Daniels was in court all four days. She told Simon Barnett and Phil Gifford Justice Cameron Mander told the gunman he has caused terrible grief and lasting pain to so many.

"He said his hatred has no place here, no place anywhere. His crimes were met with public outpouring of love for the Muslim community. People stood with those affected, their fellow New Zealanders.

"He looked at the gunman and said 'You failed'." 

She says that there were no signs of any emotion from Tarrant when the sentencing was read out, maintaining his "nonchalant" attitude that he had during the week. 

• Life sentence: Mosque gunman will never be released from jail

The trial was marked by a number of moving victim impact statements from family and loved ones of the victims. 

Daniels says that in the court trials she has covered, every victim impact statement has been different, and normal there are only a small handful. 

"This is over 90 people that got the chance to stand up in court and tell him how he changed their lives, the loved ones they lost, the memories they still hold onto that day.

"As each one ended and you tried to process what they were saying, another one stood up. It was one after another, each so deserving and so powerful in their own right."