EGRET unidentified source radio observations and performance of receiver gain calibration

Kotaro Niinuma*, Kuniyuki Asuma, Masaya Kuniyoshi, Nobuo Matsumura, Kazuhiro Takefuji, Sumiko Kida, Akihiko Takeuchi, Hajime Ichikawa, Akihiro Sawano, Naoya Yoshimura, Shigehiro Suzuki, Ryosuke Nakamura, Yu Nakayama, Tsuneaki Daishido

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)


    Last year, we have developed the receiver gain calibration system by using Johnson-Nyquist noise, for accuracy flux measurement, because we have been starting radio identification program of transient radio sources, blazars and radio counterpart of The Energetic Gamma Ray Experiment Telescope (EGRET) unidentified γ-ray sources in Waseda Nasu Pulsar Observatory. It is shown that there are a few low correlation data between receiver gain and ambient temperature around receiver for anything troubles of receiver, because we can detect gain and ambient temperature through a day by developed system. Estimated fluctuations of daily data of steady sources decrease by removing low correlation data before analysing. As the result of our analysis by using above system, radio counterpart of EGRET identified source showed fading light-curve for a week.

    Original languageEnglish
    Pages (from-to)223-224
    Number of pages2
    JournalJournal of Physics: Conference Series
    Issue number1
    Publication statusPublished - 2006 Mar 22

    ASJC Scopus subject areas

    • Physics and Astronomy(all)


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