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Study of very early phase GRB afterglows with MITSuME

  • Yoshihiko Saito (a1), Yoichi Yatsu (a1), Hideya Nakajima (a1), Nobuyuki Kawai (a1), Katsuaki Asano (a1), Yu Aoki (a1), Mayumi Hayashi (a1), Seongdeng Song (a1), Kosuke Kawakami (a1), Kazuki Tokoyoda (a1), Takahiro Enomoto (a1), Ryuichi Usui (a1), Daisuke Kuroda (a2), Kenshi Yanagisawa (a2), Hiroyasu Shimizu (a2), Hiroyuki Toda (a2), Shogo Nagayama (a3), Hidekazu Hanayama (a4), Michitoshi Yoshida (a5) and Koji Ohta (a6)...

Abstract

We review the results of very early phase optical follow-up observations of recent gamma-ray bursts (GRBs) with the multi-color optical telescopes “MITSuME”. The MITSuME telescopes were designed to perform “real time” and “automatic” follow-up observations prompted by the GCN alerts via the Internet. The rapidly slewing equatorial mounts allow MITSuME to start photometric observations within 100 seconds after the trigger for several GRBs. In particular, we detected a brightening just after the trigger for two GRBs. These phenomena could be interpreted as the “on-set” of afterglow. In this paper we summarize these optical observations with a brief interpretation.

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References

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Antonelli, L. A., D'Avanzo, P., Perna, R., et al. 2009, A&A, 507L, 45
Racusin, J. L., Karpov, S. V., Sokolowski, M., et al. 2008, Nature, 455, 183
Xin, L., Liang, E., Wei, J., et al. 2011, MNRAS 410 27
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