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.

我々は原子核乾板から成るガンマ線望遠鏡を開発し，気球フライトによる宇宙ガンマ線観測計画（GRAINE計画：Gamma-Ray Astro Imager with Nucler Emulsion）を推進している．これまでに達成した成果を概観し，将来展望について述べる．

We present an automated system for environmental testing of on-board devices used as a common bus equipment in Japan Aerospace Exploration Agency (JAXA)’s balloon-borne experiments. For each experiment, we provide users with such devices. A telemetry tracking and command system in the balloon consists of a transmitter, receiver, and main/sub balloon operator (MBO/SBO) that controls the other devices according to a set of commands and creates telemetry frames from housekeeping data. We perform environmental tests of the MBO/SBO to confirm their functionality before the assembly of the bus equipment. So far, it took 2 h/30 min to finish one cycle of the MBO or SBO, respectively, during which time an operator must be present to inspect the data. Since we repeat the cycle under some circumstances by changing the pressure and/or temperature, approximately 2 man-months were required to complete the tests. Therefore, we developed an automated test method using an IoT Edge computer, option I/O modules, and a newly developed software suite. The time to finish the cycle is reduced by ~50%:1 h for MBO/20 min for SBO, and the user can simply check the recorded test results, rather than be present. The system reduces manpower, time, and cost, avoiding unexpected human error.