GRB061028: MAGIC telescope GeV observation.

The MAGIC Imaging Atmospheric Cherenkov Telescope performed a follow-up observation of the SWIFT-BAT burst GRB061028 (GCN circular 5762, Sakamoto T. et al.). We received the GCN alert at T0+140s. The telescope slewed immediately to the GRB sky coordinates and started data taking 29s after the alert, at T0+169s. Due to the long time delay of the alert and the burst duration of T90=106s, only the early afterglow phase could be observed by MAGIC. Our observation window covered the weak tail emission measured by BAT and the X-ray afterglow measured by XRT (Sakamoto T. et al.). The observation continued for 100min.