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.
Publication Source (Journal or Book title)
Publications of the Astronomical Society of Japan
Kawakubo, Y., Sakamoto, T., Nakahira, S., Yamaoka, K., Serino, M., Asaoka, Y., Cherry, M., Matsukawa, S., Mori, M., Nakagawa, Y., Ozawa, S., Penacchioni, A., Ricciarini, S., 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) https://doi.org/10.1093/pasj/psx152