VLT observations of Fermi pulsars
  Many energetic gamma-ray pulsars discovered by Fermi are promising candidates for optical follow-ups. We present the results of the first deep optical observations of the two Vela-like Fermi pulsars PSR J1357-6429 and PSR J1048-5832 performed with the VLT. However, they have not been detected down to V~27 and V~27.6, respectively (3 sigma). These upper limits suggest an efficiency in converting spin-down power into optical luminosity < 7x10d-7 and <6x10d-6, respectively, lower than the Crab pulsar and, possibly, more compatible with the spin-down age of these two pulsars. 
R. P. Mignani (UCL-MSSL, Institute of Astronomy, University of Zielona   Gora), A. Shearer (NUI, Galway), A. de Luca (IUSS, ...
astro-ph.HE