Updates on Search for Correlations Between Sprites and TGFs By Goddard Robotic Telescope Wide Field (GRT-WF)

Although several theoretical explanations for Terrestrial Gamma-ray Flashes (TGFs) exist, we still do not clearly understand the cause of the phenomena. On the other hand, free electrons in the Earth atmosphere produce lightnings (under the TGF regions) as well as sprites (above the TGF regions) . We have been studying possible connections between sprites and TGFs. We constructed Goddard Robotic Telescope - Wide Field (GRT-WF) in June 2011, which is composed of seven wide field optical camera located at Florida Gulf Coast University (FGCU) in Fort Myers, FL, to observe sprites in all the directions of the sky. We have recorded over 600 sprites so far, and studied possible associations with TGFs detected by NASA's Fermi/GBM and RHESSI. We will present the current status of our study.