v$bh.objd of a global temporary table

v$bh_for_gtt.sql

select 
   o.owner
  ,o.object_name
  ,o.object_type
  ,o.temporary
  ,so.*
  ,bh.*
from dba_objects o, SYS.X$KTSSO so
     ,v$bh bh
where so.ktssoobjn=o.object_id 
and so.ktssoobjd=bh.objd
--and object_name='GTT name';