found the schema:

CREATE TABLE `<DB PREFIX>_authorizenet` (
id int(11) unsigned not null primary key auto_increment ,
customer_id int(11) unsigned not null default 0,
order_id int(11) unsigned not null default 0,
response_code int(11) unsigned not null default 0,
response_text varchar(255) not null default '',
authorization_type text not null default '',
transaction_id int(15) not null default 0,
sent longtext not null default '',
received longtext not null default '',
time varchar(50) not null default '',
session_id varchar(255) not null default '');

Now I need to write something to easily look this up in the order screen.