Detection of the thermal component in GRB 160107A

Yuta Kawakubo, Takanori Sakamoto, Satoshi Nakahira, Kazutaka Yamaoka, Motoko Serino, Yoichi Asaoka, Michael L. Cherry, Shohei Matsukawa, Masaki Mori, Yujin Nakagawa, Shunsuke Ozawa, Ana V. Penacchioni, Sergio B. Ricciarini, Akira Tezuka, Shoji Torii, Yusuke Yamada, Atsumasa Yoshida

Research output: Contribution to journalArticle

Abstract

We present the detection of a blackbody component in gamma-ray burst GRB 160107A emission by using the combined spectral data of the CALET Gamma-ray Burst Monitor (CGBM) and the MAXI Gas Slit Camera (GSC). MAXI/GSC detected the emission ∼45 s prior to the main burst episode observed by the CGBM. The MAXI/GSC and the CGBM spectrum of this prior emission period is fitted well by a blackbody with temperature 1.0+0.3 -0.2 keV plus a power law with a photon index of -1.6 ± 0.3. We discuss the radius of the photospheric emission and the main burst emission based on the observational properties. We stress the importance of coordinated observations via various instruments collecting high-quality data over a broad energy coverage in order to understand the GRB prompt emission mechanism.

Original languageEnglish
Pages (from-to)61-610
Number of pages550
JournalPublications of the Astronomical Society of Japan
Volume70
Issue number1
DOIs
Publication statusPublished - 2018 Jan 1

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Keywords

  • Gamma-ray burst: general
  • gamma-ray burst: individual (GRB 160107A)
  • radiation mechanisms: non-thermal
  • radiation mechanisms: thermal

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kawakubo, Y., Sakamoto, T., Nakahira, S., Yamaoka, K., Serino, M., Asaoka, Y., Cherry, M. L., Matsukawa, S., Mori, M., Nakagawa, Y., Ozawa, S., Penacchioni, A. V., Ricciarini, S. B., Tezuka, A., Torii, S., Yamada, Y., & Yoshida, A. (2018). Detection of the thermal component in GRB 160107A. Publications of the Astronomical Society of Japan, 70(1), 61-610. https://doi.org/10.1093/pasj/psx152