A deep search with the hubble space telescope for late-time supernova signatures in the hosts of XRF 011030 and XRF 020427

Andrew Levan, Sandeep Patel, Chryssa Kouveliotou, Andrew Fruchter, James Rhoads, Evert Rol, Enrico Ramirez-Ruiz, Javier Gorosabel, Jens Hjorth, Ralph Wijers, W. Michael Wood-Vasey, David Bersier, Alberto Castro-Tirado, Johan Fynbo, Brian Jensen, Elena Pian, Nial Tanvir, Stephen Thorsett, Stan Woosley