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

Journal Article · Mon May 25 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3155914· OSTI ID:21304952

Ohno, M; Kokubun, M; Suzuki, M; Takahashi, T ^[1]; Ioka, K ^[2]; Uehara, T; Takahashi, T; Fukazawa, Y; Kira, C; Hanabata, Y ^[3]; Yamaoka, K; Sugita, S ^[4]; Terada, Y; Urata, Y; Onda, K; Kodaka, N; Endo, A; Morigami, K; Sugasahara, T; Iwakiri, W ^[5]

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1. ISAS/JAXA, 3-1-1 Yoshinodai, Sagamihara, 229-8510 (Japan)
2. Theory Division, KEK (High Energy Accelerator Research Organization) 1-1 Oho, Tsukuba 305-0801 (Japan)
3. Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8526 (Japan)
4. Aoyama Gakuin University, 5-10-1 Fuchinobe, Sagamihara, 229-8558 (Japan)
5. Saitama University, 255 Shimo-Okubo, Sakura, Saitama, 338-8570 (Japan)

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.

• OSTI ID: 21304952
• Journal Information: AIP Conference Proceedings, Vol. 1133, Issue 1; Conference: 6. Huntsville symposium on gamma-ray burst, Huntsville, AL (United States), 20-23 Oct 2008; Other Information: DOI: 10.1063/1.3155914; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
AFTERGLOW
CORRELATIONS
COSMIC GAMMA BURSTS
COSMIC GAMMA SOURCES
COSMIC PHOTONS
GALAXIES
GAMMA ASTRONOMY
GAMMA DETECTION
KEV RANGE
MEV RANGE
PHOTON EMISSION
PROMPT GAMMA RADIATION
RED SHIFT
TELESCOPE COUNTERS
TIME RESOLUTION
X-RAY DETECTION