Simon Glancey has submitted the following:
Flight Sgt Brotherton was the Flight Engineer aboard Avro Lancaster II LL650 KO-J of 115 Squadron, which was shot down any a Luftwaffe night-fighter on a mission to Berlin. The Lancaster crashed at Tetlow, some 10 miles southwest of Berlin, with the loss of six of the seven crew.
Bomber Command Losses 1944, W. R. Chorley, 1997, Midland Counties Publishing, ISBN 978 0904597912, page 39.
Tony Hibberd has offered the following:
Lancaster LL650 KO-J had departed Witchford at 1644 for Ops Berlin. It was probably intercepted in the Berlin area by a Night-Fighter captained by Oblt Josef Kraft (IV/NJG5) and shot down at 1945 for his 8th Abschuss
Nachtjagd Combat Archive 1944 Part 1 Dr Theo Boiten
Robert Brotherton is remembered in Ashington on A17.43 and at Morpeth on M17.07