Bikes in church

What counts as a contemporaneous historical record?

A contemporaneous historical record ! :)

I thought there was a number of sources that suggest that there was indeed a bloke called Jesus in roughly the right place at the right time who caused a bit of a fuss and was crucified for his troubles.

No, there are no contemporaneous records to support the idea that Jesus existed outside of the bible, the first documentation is from around 40-50 years after he magicked himself out of the grave.

And many of the these 2nd hand reports (by less than impartial supporters) have insurmountable authenticity problems associated with them, like Josephus mentioning Jesus in Testimonium Flavianum - which many theologians now know was a forgery by Bishop Eusebius many centuries later.

The best proof for a 'Jesus' character outside the gospels, occurs in the Talmud, where the name 'Yeshu' is associated with a 'sorceror' who was hung during passover.

And this is all in one of the most recorded periods in antiquity.