Kenji Toma

Associate Professor

Calculated based on number of publications stored in Pure and citations from Scopus
20052022

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  • 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 proceedingConference contribution

    4 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 othersYatsu, 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 proceedingConference contribution

    1 Citation (Scopus)
  • Theoretical and observational studies on relativistic jets driven by black holes

    Toma, K., 2017, Proceedings of the 27th Workshop on General Relativity and Gravitation in Japan, JGRG 2017. Hiroshima University, p. 85-102 18 p. (Proceedings of the 27th Workshop on General Relativity and Gravitation in Japan, JGRG 2017; vol. 1).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 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 othersVestrand, 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 proceedingConference contribution

    8 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 othersKim, 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 proceedingConference contribution

    7 Citations (Scopus)
  • 2011

    A photosphere-internal shock model of Fermi/LAT GRBs

    Toma, K., Wu, X. F. & Mészáros, P., 2011 Sep 12, Gamma Ray Bursts 2010, GRB 2010. p. 98-101 4 p. (AIP Conference Proceedings; vol. 1358).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

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

    He, H. N., Wu, X. F., Toma, K., Mészáros, P. & Wang, X. Y., 2011 Sep 12, Gamma Ray Bursts 2010, GRB 2010. p. 191-194 4 p. (AIP Conference Proceedings; vol. 1358).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 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 proceedingConference contribution

  • 2010

    Models of the prompt and high energy emission of GRB

    Mészáros, P., Toma, K., Wu, X. F. & He, H. N., 2010 Dec 13, 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 proceedingConference contribution

  • 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 othersYamazaki, 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 proceedingConference contribution

    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 othersNakamura, 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 proceedingConference contribution

    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 proceedingConference contribution

  • 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 Nov 27, Gamma-Ray Burst - 6th Huntsville Symposium. p. 356-361 6 p. (AIP Conference Proceedings; vol. 1133).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    2 Citations (Scopus)
  • 2008

    Gamma-ray burst polarization

    Toma, K., 2008 Sep 26, 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 proceedingConference contribution

    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 proceedingConference contribution

  • 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 proceedingConference contribution

    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 Dec 1, 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 proceedingConference contribution

  • Shallow decay phase of X-ray afterglows

    Sato, R., Ioka, K., Toma, K., Nakamura, T., Kataoka, J., Kawai, N. & Takahashi, T., 2008 Dec 1, 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 proceedingConference contribution

    1 Citation (Scopus)
  • Statistical properties of GRB polarization

    Toma, K., Sakamoto, T., Hill, J. E., Zhang, B., Yamazaki, R., Ioka, K. & Nakamura, T., 2008 Dec 1, 2008 Nanjing Gamma-Ray Burst Conference. p. 195-200 6 p. (AIP Conference Proceedings; vol. 1065).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • Unstable e± photospheres and GRB spectral relations

    Ioka, K., Murase, K., Toma, K., Nagataki, S., Nakamura, T. & Mészáros, P., 2008 Dec 1, 2008 Nanjing Gamma-Ray Burst Conference. p. 189-194 6 p. (AIP Conference Proceedings; vol. 1065).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • Unstable GRB Photospheres and Blueshifted e± Annihilation Lines

    Ioka, K., Murase, K., Toma, K., Nagataki, S. & Nakamura, T., 2008 Dec 1, 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 proceedingConference contribution

  • 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 proceedingConference contribution

    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 proceedingConference contribution

  • 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 proceedingConference contribution