Study of Yonetoku Relation of Gamma Ray Burst by fire model

2014 Fiscal Year Final Research Report

• Project/Area Number: 23540305
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Kyoto University
• Principal Investigator: NAKAMURA takashi 京都大学, 理学(系)研究科(研究院), 教授 (80155837)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: ガンマ線バースト / 米徳関係式 / Short GRB / 重力波源

Outline of Final Research Achievements

Although Yonetoku relation for GRB (Gamma Ray Burst)　has been thought to be applied only for Long GRB, we found that it holds also for Short GRB. The correlation coefficient and the chance probability of this new relation are 0.98 and one part of hundred thousand, respectively. Applying this new correlation to bright 72 SGRBs detected by BATSE, the birth rate of SGRB near the earth is found to be one event/Mpc cubic per year. SGRB is one of the most plausible gravitational wave sources for Japanese KAGRA, LIGO and Virgo. From this event rate of SGRBs, we expect at least 4 gravitational events per year in the pessimistic case while 600 events per year in the optimistic case. Therefore gravitational wave might be observed in 2015 for the earliest case.

Free Research Field

相対論的天体物理学