Are Short GRBs Really Hard?

Journal Article · Fri May 19 04:00:00 EDT 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2207855· OSTI ID:20798690

Sakamoto, T; Cummings, J ^[1]; Barbier, L; Barthelmy, S; Gehrels, N; Parsons, A; Tueller, J; Cline, T ^[1]; Fenimore, E; Palmer, D ^[2]; Hullinger, D ^[1]; Krimm, H; Markwardt, C ^[1]; Sato, G ^[3]; Aptekar, R; Golenetskii, S; Mazets, E; Pal'shin, V ^[4]; Ricker, G ^[5]; Lamb, D ^[6]

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1. NASA Goddard Space Flight Center (United States)
2. Los Alamos National Laboratory (United States)
3. Institute of Space and Astronautical Science (United States)
4. Ioffe Physico-Technical Institute (Russian Federation)
5. Massachusetts Institute of Technology (United States)
6. University of Chicago (United States)

Thanks to the rapid position notice and response by HETE-2 and Swift, the X-ray afterglow emissions have been found for four recent short gamma-ray bursts (GRBs; GRB 050509b, GRB 050709, GRB 050724, and GRB 050813). The positions of three out of four short GRBs are coincident with galaxies with no current or recent star formation. This discovery tightens the case for a different origin for short and long GRBs. On the other hand, from the prompt emission point of view, a short GRB shows a harder spectrum comparing to that of the long duration GRBs according to the BATSE observations. We investigate the prompt emission properties of four short GRBs observed by Swift/BAT. We found that the hardness of all four BAT short GRBs is in between the BATSE range for short and long GRBs. We will discuss the spectral properties of short GRBs including the short GRB sample of Konus-Wind and HETE-2 to understand the hard nature of the BATSE short GRBs.

• OSTI ID: 20798690
• Journal Information: AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 836; ISSN APCPCS; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AFTERGLOW
COSMIC GAMMA BURSTS
COSMIC GAMMA SOURCES
COSMIC PHOTONS
COSMIC RAY DETECTION
ENERGY SPECTRA
GALAXIES
GAMMA DETECTION
X RADIATION