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Late Engine Activity of GRB 161017A Revealed by Early Optical Observations
Yutaro Tachibana, Makoto Arimoto, Katsuaki Asano +8
The long gamma-ray burst GRB 161017A was detected by Fermi and Swift, and its afterglow was observed by the MITSuME 50-cm optical telescope promptly about 50 s after the burst. Ear…
Diffuse x-ray emission from the northern arc of loop I observed with suzaku
Masahiro Akita, Jun Kataoka, Makoto Arimoto +4
After discovery of the Fermi bubbles, giant structures observed in radio to X-rays have been discussed as possi- ble evidence of past activities in the Galactic Center (GC). We rep…
The origins of the gamma-ray flux variations of NGC 1275 based on 8 years of Fermi-LAT observations
K. Tanada, J. Kataoka, M. Arimoto +4
We present an analysis of 8 years of Fermi-LAT ( > 0.1 GeV) gamma-ray data obtained for the radio galaxy NGC 1275. The gamma-ray flux from NGC 1275 is highly variable on short (~ d…