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Kenji Toma

Professor

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20052025

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  • 2024

    High-z gamma-ray bursts unraveling the dark ages and extreme space-time mission - HiZ-GUNDAM

    Wide Field X-ray Monitor Collaboration, Near Infrared Telescope Collaboration, Satellite System Collaboration, Science Collaboration & Follow-up Collaboration, 2024, Space Telescopes and Instrumentation 2024: Ultraviolet to Gamma Ray. den Herder, J.-W. A., Nikzad, S. & Nakazawa, K. (eds.). SPIE, 1309320. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 13093).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    1 Citation (Scopus)
  • 2020

    High-redshift gamma-ray burst for unraveling the Dark Ages Mission - HiZ-GUNDAM -

    Wide Field X-ray Monitor Collaboration, Near Infrared Telescope Collaboration & Science Collaboration, 2020, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray. den Herder, J.-W. A., Nikzad, S. & Nakazawa, K. (eds.). SPIE, 114442Z. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 11444).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    24 Citations (Scopus)
  • 2017

    Evaluation of a bread board model gamma-ray burst polarimeter toward installation on the international space station

    Oikawa, Y., Gunji, S., Nakamori, T., Takakura, M., Ueda, T., Kishikawa, T., Daigle, S., Gaskin, J., Ramsey, B., Wilson-Hodge, C., Preece, R. D., McConnell, M., Bloser, P., Legere, J., Yonetoku, D., Mihara, T., Hayashida, K., Kishimoto, Y., Kishimoto, S. & Takahashi, H. & 3 others, Yatsu, Y., Toma, K. & Sakamoto, T., 2017 Oct 16, 2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016. Institute of Electrical and Electronics Engineers Inc., 8069641. (2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop, NSS/MIC/RTSD 2016; vol. 2017-January).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    1 Citation (Scopus)
  • 2014

    POET: A SMEX mission for gamma ray burst polarimetry

    McConnell, M. L., Baring, M., Bloser, P., Dwyer, J. F., Emslie, A. G., Ertley, C. D., Greiner, J., Harding, A. K., Hartmann, D. H., Hill, J. E., Kaaret, P., Kippen, R. M., Mattingly, D., McBreen, S., Pearce, M., Produit, N., Ryan, J. M., Ryde, F., Sakamoto, T. & Toma, K. & 2 others, Vestrand, W. T. & Zhang, B., 2014, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray. Takahashi, T., den Herder, J.-W. A. & Bautz, M. (eds.). SPIE, 91440O. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 9144).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    9 Citations (Scopus)

  • X-ray γ-ray polarimetry small satellite PolariS

    Hayashida, K., Yonetoku, D., Gunji, S., Tamagawa, T., Mihara, T., Mizuno, T., Takahashi, H., Dotani, T., Kubo, H., Yatsu, Y., Tokanai, F., Nakamori, T., Shibata, S., Hayato, A., Furuzawa, A., Kishimoto, Y., Kitamoto, S., Toma, K., Sadamoto, M. & Yoshinaga, K. & 7 others, Kim, J., Ide, S., Kamitsukasa, F., Anabuki, N., Tsunemi, H., Katagiri, J. & Sugimoto, J., 2014, Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray. Takahashi, T., den Herder, J.-W. A. & Bautz, M. (eds.). SPIE, 91440K. (Proceedings of SPIE - The International Society for Optical Engineering; vol. 9144).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    8 Citations (Scopus)
  • 2011

    A photosphere-internal shock model of Fermi/LAT GRBs

    Toma, K., Wu, X. F. & Mészáros, P., 2011, Gamma Ray Bursts 2010, GRB 2010. p. 98-101 4 p. (AIP Conference Proceedings; vol. 1358).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • GRB 090510: Early LAT emission is not from external shock

    He, H. N., Wu, X. F., Toma, K., Mészáros, P. & Wang, X. Y., 2011, Gamma Ray Bursts 2010, GRB 2010. p. 191-194 4 p. (AIP Conference Proceedings; vol. 1358).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Study of emission mechanism of GRBs probed by the gamma-ray polarization with IKAROS-GAP

    Yonetoku, D., Murakami, T., Sakashita, T., Morihara, Y., Gunji, S., Mihara, T. & Toma, K., 2011 Apr, Death of Massive Stars: Supernovae and Gamma-Ray Bursts. San Antonio, P. W. A., Kawai, N. & Pian, E. (eds.). S279 ed. p. 425-426 2 p. (Proceedings of the International Astronomical Union; vol. 7, no. S279).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    Open Access
  • 2010

    Models of the prompt and high energy emission of GRB

    Mészáros, P., Toma, K., Wu, X. F. & He, H. N., 2010, Deciphering the Ancient Universe with Gamma-Ray Bursts. p. 13-19 7 p. (AIP Conference Proceedings; vol. 1279).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Rapidly-responding optical polarimetry of GRB afterglows with Hiroshima 1.5-m telescope and one-shot wide-field polarimeter

    Kawabata, K. S., Uehara, T., Yamanaka, M., Sasada, M., Ikejiri, Y., Itoh, R., Komatsu, T., Uemura, M., Nagae, O., Chiyonobu, S., Tanaka, H., Ohsugi, T., Fukazawa, Y., Mizuno, T., Katagiri, H., Takahashi, H., Miyamoto, H., Sakimoto, K., Hiragi, K. & Yoshida, M. & 10 others, Yamazaki, R., Toma, K., Arai, A., Isogai, M., Nakaya, H., Kamata, Y., Miyazaki, S., Yamashita, T., Suzuki, M. & Sato, S., 2010, Deciphering the Ancient Universe with Gamma-Ray Bursts. p. 355-356 2 p. (AIP Conference Proceedings; vol. 1279).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    1 Citation (Scopus)
  • 2009

    GRB polarimetry with POET

    McConnell, M. L., Angelini, L., Baring, M. G., Barthelmy, S., Black, J. K., Bloser, P. F., Dennis, B., Emslie, A. G., Greiner, J., Hajdas, W., Harding, A. K., Hartmann, D. H., Hill, J. E., Ioka, K., Kaaret, P., Kanbach, G., Kniffen, D., Legere, J. S., Macri, J. R. & Morris, R. & 8 others, Nakamura, T., Produit, N., Ryan, J. M., Sakamoto, T., Toma, K., Wu, X., Yamazaki, R. & Zhang, B., 2009, Gamma-Ray Burst - 6th Huntsville Symposium. p. 64-66 3 p. (AIP Conference Proceedings; vol. 1133).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    9 Citations (Scopus)

  • Statistical properties of gamma-ray burst polarization

    Toma, K., Sakamoto, T., Zhang, B., Hill, J. E., McConnell, M. L., Bloser, P. E., Yamazaki, R., Ioka, K. & Nakamura, T., 2009, Gamma-Ray Burst - 6th Huntsville Symposium. p. 434-436 3 p. (AIP Conference Proceedings; vol. 1133).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    Open Access

  • The correlation of spectral lag evolution with prompt optical emission in GRB 080319B

    Stamatikos, M., Ukwatta, T. N., Sakamoto, T., Dhuga, K. S., Toma, K., Pe'er, A., Mészáros, P., Band, D. L., Norris, J. P., Barthelmy, S. D. & Gehrels, N., 2009, Gamma-Ray Burst - 6th Huntsville Symposium. p. 356-361 6 p. (AIP Conference Proceedings; vol. 1133).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    2 Citations (Scopus)
  • 2008

    Gamma-ray burst polarization

    Toma, K., 2008, KEK Cosmophysics Group Inaugural Conference - Accelerators in the Universe - Interplay between High Energy Physics and Cosmophysics. p. 186-190 5 p. (AIP Conference Proceedings; vol. 1040).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    1 Citation (Scopus)

  • Investigation of jet break features in Swift gamma-ray bursts

    Sato, G., Yamazaki, R., Ioka, K., Sakamoto, T., Takahashi, T., Nakazawa, K., Nakamura, T., Toma, K., Hullinger, D., Tashiro, M., Parsons, A. M., Krimm, H. A., Barthelmy, S. D., Gehrels, N., Burrows, D. N., O'Brien, P. T., Osborne, J. P., Chincarini, G. & Lamb, D. Q., 2008, 11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity. World Scientific Publishing Co. Pte Ltd, p. 2033-2035 3 p. (11th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Gravitation and Relativistic Field Theories - Proc. of the MG11 Meeting on General Relativity).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • POET: Polarimeters for energetic transients

    Hill, J. E., McConnell, M. L., Bloser, P., Legere, J., Macri, J., Ryan, J., Barthelmy, S., Angelini, L., Sakamoto, T., Black, J. K., Hartmann, D. H., Kaaret, P., Zhang, B., Ioka, K., Nakamura, T., Toma, K., Yamazaki, R. & Wu, X., 2008, 2008 Nanjing Gamma-Ray Burst Conference. p. 331-337 7 p. (AIP Conference Proceedings; vol. 1065).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    Open Access
    20 Citations (Scopus)

  • Probing the Efficiency of Electron-Proton Coupling in Relativistic Collisionless Shocks through the Radio Polarimetry of Gamma-Ray Burst Afterglows

    Toma, K., Ioka, K. & Nakamura, T., 2008, Gamma-Ray Bursts 2007 - Proceedings of the Santa Fe Conference. p. 472-475 4 p. (AIP Conference Proceedings; vol. 1000).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    Open Access

  • Shallow decay phase of X-ray afterglows

    Sato, R., Ioka, K., Toma, K., Nakamura, T., Kataoka, J., Kawai, N. & Takahashi, T., 2008, Gamma-Ray Bursts 2007 - Proceedings of the Santa Fe Conference. p. 32-35 4 p. (AIP Conference Proceedings; vol. 1000).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    1 Citation (Scopus)

  • Statistical properties of GRB polarization

    Toma, K., Sakamoto, T., Hill, J. E., Zhang, B., Yamazaki, R., Ioka, K. & Nakamura, T., 2008, 2008 Nanjing Gamma-Ray Burst Conference. p. 195-200 6 p. (AIP Conference Proceedings; vol. 1065).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Unstable e± photospheres and GRB spectral relations

    Ioka, K., Murase, K., Toma, K., Nagataki, S., Nakamura, T. & Mészáros, P., 2008, 2008 Nanjing Gamma-Ray Burst Conference. p. 189-194 6 p. (AIP Conference Proceedings; vol. 1065).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • Unstable GRB Photospheres and Blueshifted e± Annihilation Lines

    Ioka, K., Murase, K., Toma, K., Nagataki, S. & Nakamura, T., 2008, Gamma-Ray Bursts 2007 - Proceedings of the Santa Fe Conference. p. 377-380 4 p. (AIP Conference Proceedings; vol. 1000).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

  • 2006

    Early afterglow and variability

    Ioka, K., Kobayashi, S., Zhang, B., Kenji, T., Yamazaki, R. & Nakamura, T., 2006 May 19, GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. p. 301-304 4 p. (AIP Conference Proceedings; vol. 836).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    1 Citation (Scopus)

  • Shallow decay of early X-ray afterglows from inhomogeneous gamma-ray burst jets

    Toma, K., Ioka, K., Yamazaki, R. & Nakamura, T., 2006 May 19, GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. p. 337-340 4 p. (AIP Conference Proceedings; vol. 836).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    Open Access

  • Tail emission of prompt gamma-ray burst jets

    Yamazaki, R., Toma, K., Ioka, K. & Nakamura, T., 2006 May 19, GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. p. 205-208 4 p. (AIP Conference Proceedings; vol. 836).

    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

    Open Access