HETE alert 4006: MASTER promt optical limit. Lipunov, V. ; Kornilov, V. ; Krylov, A. ; Kuvshinov, D. ; Tyurina, N. ; Belinski, A. ; Gorbovskoy, E. ; Antipov, G. ; Vladimirov, V. ; Sankovich, A. ; Shatsky, N. Abstract Publication: GRB Coordinates Network Pub Date: 2006 Bibcode: 2006GCN..4549....1L