New probes of GRB prompt emission properties using wide-band spectroscopy by Suzaku Wide-band All-sky Monitor

• Main Authors: Ohno, M., Kokubun, M., Suzuki, M., Takahashi, T., Ioka, K., Uehara, T., Fukazawa, Y., Kira, C., Hanabata, Y., Yamaoka, K., Sugita, S., Terada, Y, Urata, Y., Onda, K., Kodaka, N., Endo, A., Morigami, K., Sugasahara, T., Iwakiri, W.
• Format: Conference Proceeding
• Language: English
• Subjects: AFTERGLOW; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CORRELATIONS; COSMIC GAMMA BURSTS; COSMIC GAMMA SOURCES; COSMIC PHOTONS; GALAXIES; GAMMA ASTRONOMY; GAMMA DETECTION; GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; KEV RANGE; MEV RANGE; PHOTON EMISSION; PROMPT GAMMA RADIATION; RED SHIFT; TELESCOPE COUNTERS; TIME RESOLUTION; X-RAY DETECTION
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.3155914

Although the afterglow observations in HETE-2 and Swift era have revealed a lot of afterglow properties of gamma-ray bursts (GRBs), we still have poor understanding of the prompt gamma-ray emission, such as the emission mechanism of the prompt emission and differences between short and long duration GRBs. We have observed many prompt emission of GRBs by Suzaku Wide-band All-sky Monitor in wide energy range of 50-5000 keV, with very large effective area of 400 cm{sup 2} even at 1 MeV. Furthermore, a combination of the Suzaku/WAM and Swift data provides us not only wider energy range of 15-5000 keV but also redshift information even for some short GRBs. Thanks to these information, we can firstly investigate an intrinsic correlation for short GRBs like E{sub peak}-L{sub iso} relation, and we can derive the same type of relation for time-resolved spectra of long GRBs in finer time-scale with higher statistics than ever before. These results could be used to discuss the differences between short and long GRBs, and our time-resolved E{sub peak}-L{sub iso} relation also could be used as both more appropriate redshift indicator and new probe of the fireball dynamics.