GRAINE Project: Analysis Status of Balloon Experiment in 2015

Cosmic gamma-ray observation provides much information on high energy objects and phenomena in space. Sub-GeV/GeV gamma-ray astronomy has been developed by projects such as EGRET, AGILE, and Fermi; however, many problems have yet to be solved. Not only high statistics observation but also high quality observation are required to advance gamma-ray astronomy. Therefore, we promote the GRAINE project, of which the aim is precise and polarization observations with an emulsion gamma-ray telescope. The balloon flight was performed in Australia during 2015. We aimed for the detection of the Vela pulsar and verification of the overall performance of the telescope. In this paper, we report the analysis status of the balloon flight during 2015.